Wipe off the end of the dipstick with a rag, and notice the markings located near the end of the dipstick. Insert the dipstick back into tube, remove it immediately, and read the level. Do not overfill. AAA recommends that consumers change their oil between 5,000 and 7,500 miles, when driving under normal conditions. New engine oil will generally have a light gold to brown tint and should be nearly transparent.
Synthetic oil is normally darker in color, sometimes almost black.
If the oil appears milky or thick, or if it is very thin and has a strong fuel odor, there may be a mechanical problem with the engine. If this is the case, have the vehicle checked by a qualified technician. The second letter is the service class designator, which has been sequentially assigned since the service classification system started. AAA recommends that motorists use the highest designated oil in their vehicles. Synthetic Oils and Oil Additives Synthetic engine oils possess performance characteristics that are more desirable than conventional engine oil.