Tom

Tom,

Q I have a 2002 Chevy Cavalier with a 2.2-liter four-cylinder engine.

Lately, it has been running rough. The other day I checked the oil to see if it
was low, and it looked weird. Instead of that clear caramel color, it looked
like light chocolate milk. Is this an indication of trouble? Please help!

Candy—Cincinnati,   Ohio

Candy,

A This would explain the engine running rough. Based on the color of the

oil you describe, I would say that a head gasket has blown in your engine.
When a head gasket blows, if it’s close to a coolant passageway in the head,
water is allowed to spill down into the crankcase (or oil pan). This
contaminates the oil, causing it to take on a milky appearance. If run too long
in this condition, the lower end of the engine will suffer. Rod and main
bearings will be damaged because the oil has mixed with water, which causes
heat and friction buildup. If let go too long, it causes engine failure. Get it
into a shop to confirm my suspicions. I think you’ll find this to be the case.