American Petroleum Institute (API) Engine Oil Identification Symbol
This symbol means that the oil has been certified by the American Petroleum Institute (API). The manufacturer only recommends API Certified engine oils.
CAUTION!
Do not use chemical flushes in your engine oil as the
chemicals can damage your engine. Such damage is
not covered by the New Vehicle Limited Warranty.
See also:
Cooling System – Drain, Flush, And Refill
If the engine coolant (antifreeze) is dirty and contains a considerable amount
of sediment, clean and flush with reliable cooling system cleaner. Follow with a
thorough rinsing to remove all depos ...
Engine Oil Selection
For best performance and maximum protection for all engines under all types of
operating conditions, the manufacturer recommends engine oils that are API Certified
and meet the requirements of Chr ...
Emissions Inspection And Maintenance Programs
In some localities, it may be a legal requirement to pass
an inspection of your vehicle’s emissions control system.
Failure to pass could prevent vehicle registration.
For states that require ...