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Frequently Asked Questions

This page contains some of our frequently asked questions. If you have a question that is not answered here, please e-mail us.

General | Diesel | Trans | Motorcycle | 2-Cycle | Snowmobile
Oil Filter | Oil Additives | Warranty

General

Diesel

Transmission

Motorcycle

2-Cycle

Oil Filters

Warranty

Oil Additives

Snowmobile

 

How long have AMSOIL lubricants been on the market?
Over 30 years. AMSOIL introduced the first synthetic motor oil with an API (American Petroleum Institute) Service Classification in 1972.  Since that time, AMSOIL has led the industry in the development of synthetic lubricants.
 

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What are AMSOIL Synthetic Motor Oils?
AMSOIL Synthetic Lubricants are fuel efficient, extended life lubricants manufactured from select synthetic base stocks and special purpose additives. These lubricants provide significantly improved overall performance characteristics when compared to conventional petroleum oils.
 

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Can AMSOIL Motor Oils be used in any engine?
Certainly, AMSOIL Motor Oils may be used in any mechanically sound gasoline or diesel fueled engine. Basically, that means they are excellent for use in any vehicles engine.
 

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Will AMSOIL Motor Oils void my new car/truck warranty?
Absolutely not!  Manufacturers' warranties are based on the use of oils meeting specific API Service Classifications, for example SJ/CF. (AMSOIL lubricants meet the current API Service requirements and, thus, are perfectly suited for use in any new vehicle without affecting the validity of the new vehicle warranty.  Please click here for detailed Warranty Law information that all consumers need to know.

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Why should I switch to AMSOIL?
Chances are, you're not driving the same car you were when you started driving. Automotive technology has changed a great deal, even in just the past few years. Today's cars have more power, use less gas and have smaller engines than ever before. High performance mixed with small engines means high stresses and increased demands on motor oil.
Using an oil designed for today's needs can make a world of difference for you and your automobile by providing you:

  • Lower repair costs

  • The convenience of fewer oil changes

  • Easier cold weather starting

  • Better cold/hot temperature protection

  • Better gas mileage

  • Longer engine/equipment life

  • Better engine performance

  • Cleaner exhaust

These factors and the overall savings realized by using AMSOIL Synthetic Motor Oil makes switching to AMSOIL the smart and easy choice.

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Why should I use AMSOIL when I don't put allot of miles on my car per year?
Chances are, you're not driving the same car you were when you started driving. Automotive technology has changed a great deal, even in just the past few years. Today's cars have more power, use less gas and have smaller engines than ever before. High performance mixed with small engines means high stresses and increased demands on motor oil.
Using an oil designed for today's needs can make a world of difference for you and your automobile by providing you:

  • Lower repair costs

  • The convenience of fewer oil changes

  • Easier cold weather starting

  • Better cold/hot temperature protection

  • Better gas mileage

  • Longer engine/equipment life

  • Better engine performance

  • Cleaner exhaust

These factors and the overall savings realized by using AMSOIL Synthetic Motor Oil makes switching to AMSOIL the smart and easy choice.

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Why are AMSOIL Motor Oils capable of extended drain intervals?
It's all in the formulation. AMSOIL uses top-quality synthetic basestocks along with top-quality additives in the manufacturing of their oils. This combination of basestocks and additives makes AMSOIL Synthetic Motor Oils highly resistant to the destructive effects of heat by not breaking down like petroleum oils.
This means that AMSOIL Motor Oils can provide much longer drain intervals then conventional lubricants.
Other oil companies do not use top-quality basestocks and additives because it doesn't pay to use them in their short lived oils.

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Are AMSOIL Motor Oils all-season motor oils?
Yes. Synthetic oils are made to protect and perform better than petroleum oils at both high and low temperature extremes. That's why every jet engine in the world is lubricated with synthetic oil. AMSOIL Motor Oils have extremely low pour points and flow readily at extremely low temperatures for easier winter starting and reduced engine wear. At high temperatures, no conventional motor oil can compare to the overall protection AMSOIL Synthetic Motor Oils provide. That's extremely important for today's turbocharged and small, non-turbocharged engines.

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Will AMSOIL Motor Oils increase my gas mileage?
Tighter government regulations and increases in engine manufacturers' demands are calling for more fuel efficient lubricants. AMSOIL Motor Oils reduce friction and drag better than petroleum oils and other synthetic oils, resulting in significant fuel economy increases.  In a recent 1.2 million mile demonstration, AMSOIL Lubricants showed a 4.5% increase in gas mileage. Other tests have shown increases as much as 15% under certain weather and driving conditions. Yet, because every vehicle is different, as are driving habits and conditions, it may be difficult  for some to see the increase while others notice it right away.
Just remember that, even without the fuel increase you are still receiving:

  • The convenience of fewer oil changes

  • Easier cold weather starting

  • Better cold/hot temperature protection

  • Lower repair costs

  • Longer engine/equipment life

  • Better engine performance

  • Cleaner exhaust

No other motor oil can give you all this!
 

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Will AMSOIL Motor Oils decrease oil consumption?
Yes. When used in mechanically sound engines, AMSOIL Motor Oils can reduce oil consumption. Under test conditions, a reduction of as much as 42% was demonstrated for prolonged periods. However, this should not be taken to mean that AMSOIL Motor Oils are "cure-alls" for engines that consume oil because of mechanical problems.

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Are AMSOIL Motor Oils compatible with other motor oils?
Yes, AMSOIL Motor Oils are compatible with all other synthetic or petroleum motor oils.

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Is there a recommended procedure for changing AMSOIL Motor Oils?
There are no special requirements, however in older vehicles or those with high mileage, it may be advisable to use AMSOIL Engine Flush first. This will ensure that the engine is clean and free of any accumulated contaminants which might have an effect on the service life of AMSOIL Motor Oils. In all cases, it is good judgment to install a new AMSOIL SDF Oil Filter every time you change oil.
See Converting to AMSOIL for more detailed information.

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Should oil additives or after market products be added to AMSOIL Motor Oils?
No, they are not necessary and are extremely detrimental. AMSOIL Motor Oils are properly formulated under the strictest Quality Control procedure to provide superior lubrication performance. See Oil Additives for more detailed information.

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I was told AMSOIL SDF Oil Filters are inferior to "Wix (Napa) filters that cost half the price!". Is there any truth to this?
In regard to AMSOIL Super Duty Oil Filters being inferior to Wix (NAPA) filters based upon visual inspection, AMSOIL Filters have an inner beauty that's not visible to the human eye. Unlike the person who made these comments, the Society of Automotive Engineers recognized that filter performance cannot be evaluated by visual inspection. Therefore, they created the industry standard SAE HS806 test for evaluating oil filters. The SAE HS806 test evaluates particle removal efficiency and contaminant holding capacity which are the two main functions an oil filter must perform. As you can see from the following charts, AMSOIL outperforms the competition in both areas.
The Super Duty Filter has a finer filtering media, more dirt holding capacity, heavier-duty construction and a 6-month/12,500-mile change interval recommendation which is the highest in the industry. Change a Wix (NAPA) filter two to three times as often at half the price and it will cost more. There will also be more and larger particles of dirt in your oil at all times if you don't choose the AMSOIL Super Duty.

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Why does AMSOIL say to change the AMSOIL SDF Oil Filter at six months regardless of the mileage. I have only gone 5,000 miles and figure that I could go the whole year without changing it and be good?
Once an engine is run with new oil, byproducts of combustion are introduced into the oil. These byproducts are harmful chemicals that continue to degrade the integrity of the motor oil as well as the oil filter media even though the engine may be off. This is why a time limit is published as well as mileage.
Short trip driving can be just as detrimental to motor oil and filters as high mileage use, and even more so in some cases. It’s possible that the oil is still intact at the end of the published time limit, but oil analysis would be needed to verify this. Heavy trucks use this practice regularly, however in small sump capacity engines, the cost of the test is nearly as much as the cost of an oil change.

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Will my oil pressure or idle rpm change when I switch to AMSOIL?
They might. AMSOIL is a better friction reducer than conventional oils and friction directly affects oil pressure and idle speed. Less friction in the engine will lead to lower oil pressure and more rpm's at idle. Since synthetic oil doesn't have to 'push' as hard to overcome friction as conventional oil does, the oil pressure drops. The engine still has adequate oil circulation, but like the heart of a marathon runner, the engine doesn't have to work as hard for the end result.
The change in idle speed is similar to the difference of running through water verses running on dry land. You run more slowly in water because the water resists your movement more than the air does. In an engine, conventional oils slow moving parts due to their inherent higher frictional properties. AMSOIL Synthetic Motor Oils allow parts to move more freely due to their low levels of friction. Again, the engine doesn't have to work as hard for the end result.

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How can I use AMSOIL when my owners manual says I must use a 5w-20 motor oil in my engine?
You do not need to use a 5W-20 oil. Do not let your dealer/owner's manual scare you by telling you that you have to use it for your warranty.  Once you know the facts and the Federal Magnuson Moss Act law, you will be much better informed to protect your rights and use the type of oil you want to use. See the 5w-20 Issue for more detailed information.

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What should I use, 0w-30, 5w-30 or 10w-30 oil?
Click here for a detailed explanation.

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What causes the oil foaming and drivability problems in Ford/International diesel engines. How can I prevent this?
Navistar/International diesel diesel engines with Hydraulic Electronic Unit Injectors, used in Ford pickups, vans and school buses, sometimes suffer drivability problems due to oil foaming. Leaching of RTV silicone from the oil pan gasket into the oil causes the foaming. Foamy oil interferes with fuel injection, which reduces engine power.
The ASTM D 892 Foam Test, Sequences 2 and 4, are used to evaluate diesel oils on their foaming characteristics relevant to this engine. Recent testing performed by an independent lab shows the results below.
According to test results, AMSOIL Synthetic 15W-40 Heavy Duty Diesel and Marine Oil (AME) and AMSOIL Series 2000 Synthetic 5W-30 Heavy Duty Diesel Oil (HDD) are clearly not prone to foaming or contributory to the foam-caused drivability problems of the IH engine.
The test also shows AME and HDD dissipate foam more quickly than Rotella T, a popular diesel oil often recommended by Ford. Faster foam dissipation means reduced foam related drivability problems.

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How can AMSOIL's Universal ATF meet all the different frictional characteristics of the transmissions that it does?
AMSOIL Universal ATF chemistry has been separately tested against each auto manufacturer's specifications and meets all of the requirements for each. It can, therefore, be used in all applications specifying those requirements. The unique, and more advanced, chemistry of this lubricant allows it to meet the proper frictional characteristics for Ford MERCON, MERCON V, DEXRON II, DEXRON III, Chrysler ATF+, ATF+2, ATF+3, ATF+4, Allison C-3 and C-4, Caterpillar TO-2 and TO-3, Toyota Type T, T-IV and applications requiring Honda Z-1 transmission fluids.

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Why isn't Redline Oil listed in AMSOIL Four-Ball Wear Test comparisons?
Because Redline produces and sells much less volume we have little to gain by “recognizing” them in our literature or our labels. We want to avoid the potential of introducing some of our customers to a competitor whom they never heard of. For this reason we made a conscious decision to only include companies in our testing that were significantly larger than us, where the most benefit can be gained by performance comparison.
AMSOIL Series 2000 20W-50 still outperforms Redline 20W-50 in the 4-Ball Wear Test, but we did not believe it was in our best interest to continue to include them on our labels or literature. We do, however, understand that there are individuals in special situations who need to affirm the superior performance comparisons to specific small competitors.

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When replacing gear oil in a truck differential with limited slip, do I have to add the limited slip differential additive that the manufacturer calls for when using AMSOIL?
All AMSOIL Gear Oils are formulated with friction modifiers for limited slip differential applications. There is no need to add additional additives. However, AMSOIL Slip-Lock  may be utilized if rear end chatter persists.|
NOTE: Most vehicle manufacturers recommend driving a vehicle in tight figure "8" patterns eight to ten times after changing limited slip lubricants.

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I sometimes hear "Synthetic oils contain detergents that can make the oil seals leak in older cars." Is this really an issue? How old would a car have to be to not use synthetics?
Synthetic lubricants do have an inherent detergency that cleans and removes conventional motor oil deposits left over in an engine. However, motor oils are designed to help swell seals slightly to prevent leakage. The only time you would observe seal leakage is if the seals are already damaged or showing signs of leakage around them. As long as the vehicle has been well maintained, and in good mechanical condition, it can be switched to a synthetic lubricant at any mileage.

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Is it safe to use AMSOIL 10W-30 in a small engine that calls for SAE 30 petroleum motor oil?
Yes, it is safe to use AMSOIL 10W-30 in an engine that calls for an SAE 30 petroleum oil. All 30 weight oils, whether a 5W-30, 10W-30 or straight 30 weight, perform as 30 weight oils at operating temperatures. The "w" indicator in multigrade oils (10W-30) refers to the oil's cold weather properties. You can think of "w" as standing for "winter" Therefore, a 10W-30 oil meets the "10w" criteria when cold and the "30" criteria when hot.

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I just bought a 2000 Suzuki Savage 650 and want to change it over to AMSOIL.  I have been debating on which oil to use in it and was wondering if the new 4-stroke oil would work the best.  My bike is a big single cylinder.  It has 3k miles on it.  I ride in Utah at 4-6k feet above sea level.  Also, the bike has a wet clutch on it. What should I use?
Although the AMSOIL 4-stroke Oil would provide excellent performance in this application, the recommended motor oil is the AMSOIL Synthetic 10W-40 Motorcycle Oil.  This lubricant is formulated specifically for motorcycles and is wet clutch-compatible.

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Can I use AMSOIL 0w-40 in my new 4-stroke snowmobile?
Absolutely! AMSOIL 0W-40 was specifically formulated for use in small, hard working 4-stroke engines. AMSOIL 0W-40 is ideal for 4-cycle snowmobiles, ATV's, personal watercraft, 4-stroke boat motors, lawn equipment etc..

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I have a 2000 Yamaha Wave Runner Personal Watercraft that requires the use of "Yamaha brand" injector oil. What should I use?
AMSOIL Synthetic Interceptor or 2-Cycle Injector Oil may be used in this application. They meet all of the specifications for Yamaha watercraft and are safe for catalytic converters.

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A 24cc 2-cycle pre-mix engine manufacturer recommends 50:1 mix when using synthetic oil. What ratio should I use when using AMSOIL 100:1 pre-mix oil, 50:1 or 100:1?
AMSOIL Synthetic 100:1 Pre-Mix 2-Cycle Oil is recommended for use at a 100:1 mix ratio in normal service applications where 50:1 to 80:1 are recommended. For severe duty service such as racing applications and for hot operation industrial motors that run for extended periods of time, richer mix ratios of 50:1 to 80:1 are recommended.

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Is it okay to break in a new two-cycle chain saw engine using AMSOIL Synthetic 100:1 Pre-Mix 2-Cycle Oil, or should another oil be used?
It is not necessary to break in two-cycle engines with another oil. AMSOIL 2-Cycle Oils may be used immediately in new two-cycle engines.

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