Which engine oil and transmission oil does a cavalier 1998 use?
5w30 for engine oil. Dexron 3 for transmission fluid on an automatic.
It is possible to thin the engine oil far enough that it loses it's lubricating ability and could cause irrepairable harm to the engine. Engine oil lubricates. Transmission oil is designed to run through a pump as it lubricates. An automatic transmission is a pump. Totally different from the oil pump found in an engine.