Question about 2002 Cadillac Deville

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Oil disappearing with no visible leaks and engine not using oil.

My 2002 Cadillac DTS with 61,000 miles uses one quart of oil every 800 miles. There are no visible leaks and the engine do not appear to be burning the oil. There are no running problems and the check engine is not on. The PCV has been replaced and no oil is in the air breathing system. No oil is visible in the water system. I purchased this car at 56,000 miles and I do not know exactly what type of oil was being used in this car. I use GM recommended 5-30 weight oil (Castro). This is a fine car otherwise. I am perplexed.

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Check out this thread and take your Caddy for a couple of Wide Open Throttle runs on the Interstate. Clears out the carbon buildup on the rings that is causing oil blowby.

http://townhall-talk.edmunds.com/direct/view/.f1078f6/0

Posted on Jan 02, 2010

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I would have the oil and filter changed and look for evidence of anything unusual. With some engines it is considered "normal" to use a quart in 800 - 1000 miles. I've read that your Cadillac normally uses a guart every 1000 - 2000 miles. I would change to a quality synthetic oil such as Castrol or Mobil 1 and expect somewhat less consumption.

Posted on Nov 21, 2008

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Mine is using oil as well, I had the engine replaced with a 6,0 New and it is using a quart every 600 miles. What is going with this engine?

Posted on Jun 22, 2013

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