American Petroleum Institute (API) Engine Oil Identification Symbol
Jeep Grand Cherokee / Jeep Grand Cherokee Owners Manual / Maintaining your vehicle / Maintenance Procedures / Engine Oil / 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.
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What Causes Corrosion?
Corrosion is the result of deterioration or removal of paint and protective coatings
from your vehicle.
The most common causes are:
• Road salt, dirt and moisture accumulation.
• Stone and gr ...