Short trip driving is tough on engines
According to a recent survey conducted
by the U.S. Bureau of Public Roads, 63 percent of motor vehicle trips equal six
or fewer miles. The American Petroleum Institute, however, has indicated
that engines require as much as six miles of travel to reach normal operating
temperatures. Frequent short trips often allow water, fuel and acids to
accumulate in the oil and sludge and varnish to form in the engine. AMSOIL
synthetic motor oils are formulated to protect engines from the rigors of
short-trip, severe-service driving.
Water: Water is a normal
combustion by-product that bypasses the piston rings in its gaseous state, then
condenses on internal engine walls when the motor oil is not warm enough to
drive it off as steam. Circulating oil picks up the water and carries it
to the oil filter. Full flow filters cannot trap water, so it continues to
circulate with the oil, where it depletes additives and reduces the oil's
ability to lubricate. If the oil is heated to "normal" operating
temperatures (200-220 degrees F), the water returns to a gaseous state (steam)
and is vented out of the engine. However, when the engine is shut down,
the water may accumulate on engine metals, promoting rust. AMSOIL
synthetic motor oils contain top-performing anti-rust agents that cling to metal
surfaces and protect them from rust even when the engine is not running.
Fuel: In vehicles equipped with
carburetors, fuel accumulates in the oil during repeated short-trip driving
because the engine runs with a closed choke when it's cold. The closed
choke allows more fuel than can be burned into the combustion chamber. The
excess fuel bypasses the rings and gets into the crankcase. Warming the
engine to normal operating temperatures, as usually occurs during trips longer
than six miles, promotes fuel evaporation.
With the advent of fuel injection
systems, fuel dilution problems have been significantly reduced. Using
AMSOIL Performance Improver can keep fuel injectors free of deposits and working
Acids: Some fuel by-products
interact with water to form acids. The water must be in its liquid form,
so this process takes place more readily in the cool short-trip engine than in
the warm long-trip engine. AMSOIL synthetic motor oils are high TBN (Total
Base Number) oils, which means they have maximum acid-neutralizing chemistry.
Most passenger car motor oils are formulated with significantly less TBN than
AMSOIL synthetic motor oils do.
Sludge and varnish: Sludge (a
soft, sticky material that accumulates on surfaces) and varnish (a hard material
that adheres to surfaces) form as water, acids and other oil contaminants
interact in the oxidizing engine environment. Since short-trip driving
encourages water contamination of the engine oil, vehicles frequently engaged
in short-trip driving are prone to developing sludge and varnish. Because
AMSOIL synthetic motor oils are highly resistant to oxidation and contain
powerful acid fighting TBN chemistries and high-quality detergents and
dispersants, their use inhibits sludge and varnish formation.
Extended drain service: The high
TBN, generous anti-rust content, high-quality detergents and dispersants and
outstanding oxidation resistance of AMSOIL synthetic motor oils allows them to
be used for extended drain intervals, even in short-trip driving, and still
provide better engine protection than conventional oils do. But always
remember to observe time and mileage when calculating drain intervals with
XL-7500 products. It's time for a change when you accumulate 7,500 miles
or have been driving with the oil installed for 6 months, whichever comes first.
AMSOIL is the undisputed leader in synthetics...
is Proudly Made in the U.S.A.