1. What are the main lubrication problems in passenger car
engines?.
MostLubrication problems for passenger car engines fall primarily
into the following areas: [/color]
Low-temperature or light-duty operation. This is when a car makes
a lot of short trips that never allow the engine to reach its
optimum operating temperature. Partially burned fuel byproducts can
result in sludge deposits and excessive rust.
High-temperature oxidation. Engine operating temperatures today
are extremely high while the amount of oil in the sump is small, as
little as four quarts. This severe heat stress on the oil can
accelerate oil oxidation, resulting in oil thickening, loss of
lubricating properties, varnish and piston deposits.
Passenger car engines deliver high horsepower in relation to the
size and weight of engine components. This places great stress on
engine parts such as the valvetrain, which strains to provide the
high cam lift and spring loads required for efficiency and high
engine speeds.
The use of air-pollution control devices such as positive
crankcase ventilation and exhaust gas recirculation can increase
the heat stress on an oil and increase the amount of contaminants
in the oil.
2. How can I be sure I'm getting high-quality oil?
Ok, Throughout the world there are many differences in the oils. In
general, name brand oil meets or exceeds automobile manufacturer
specifications, industry standards and governmental regulations.
Users should use the type of oil recommended in their vehicle
handbook/owners manual or an oil that claims to be approved by the
manufacturer of their vehicle. After this, owners may look to an
industry standard, such as from JASO, ACEA or API, for guidance.
The licenses ILSAC Certification Mark or "starburst symbol" to be
placed on the front of oil bottles, certifying that those oils are
the appropriate oil for gasoline-powered passenger cars, light
trucks, minivans and SUVs.
