2001 cadi deville

"James Jeter" wrote

Number one: how low? Do you have a more specific idea of how many miles per quart you are getting? It's actually quite normal for these engines to consume oil at a higher rate then a lot of the other GM engines. This is a very high performance engine designed for low friction operation.

There are a couple of things that you can do to perhaps alleviate the problem. Do not overfill the engine with oil. Because of the design of the engine and amount of oil in the engine, if you check the level of the oil as soon as you shut the engine off, it will often read 1/2 to 1 quart low. If you leave the engine for 5 to

10 minutes and then check the oil, a lot of oil drains back into the pan. Try this for a while. Check the engine oil after the engine has been shut off for 5-10 minutes, and then make sure you only have it filled to halfway between the full and add marks on the dipstick. This engine takes 7.5 liters of oil on an oil change, and I've installed up to 8.5 liters after the oil pan has been off and completely drained....so there is a lot of oil capacity. You can easily run the engine down a quart with no damage to the engine. What seems to happen is that people check the oil level as soon as the engine is shut off, think it's low, add another quart, now its overfull and it burns it off due to it being overfull.

Another item, if you have the time and a clear road where you won't get busted by the police for stunting......drive at about 45 miles an hour, shift down into

2nd gear, go full throttle in 2nd gear until you get up to 70-75 miles an hour, take your foot off the gas and let the car coast back down to 45 (still in 2nd gear), then repeat. Do that a couple of time a week if possible.

Ian

I have a 2001 STS (same engine?) but haven't noticed oil loss. Have you check the antifreeze for oil leakage? How about colour exhuast?