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Mar 3, 2013, 8:29 AM

Post #1 of 2 (1122 views)
black oil Sign In

2006 cadillac srx 6cyl 62000 miles bought it used with 52000 on it car tells you when to change oil but check oil with about 50% left to go and noticed the oil was real black and down a quart of oil so i changed the oil with synthetic like it called for maybe the dealer didnt change it? ha so i changed it and kept checking it and there is no leaks no signs of leaks but uses oil and the oil at 50%is real black again its been about 3000 miles since i changed the oil and filter and i have to add 1 quart of oil now nothing leaking and doesnt seem to be blowing blue smoke or smelling of oil?

Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 3, 2013, 9:48 AM

Post #2 of 2 (1095 views)
Re: black oil Sign In

Looks like the oil is doing its job. Maybe the person that had the car before you had never changed the oil or didn't change it as often as it should have been changed. Could be sludged up in the inside of the engine and now the sythetic oil is slowly breaking down the sludge.

There is a TSB (11-06-01-004C) on oil consumption on those engines because of the air cleaning housing leaking allowing unfiltered air into the engine. If the unfiltered air is allowed into the engine it will take out the piston rings causing oil consumption. You might not see oil smoke coming out of the tailpipe because it isn't burning enough oil to produce visible smoke. All engines burn oil up to a certain amount. It only becomes a problem if it becomes excessive as your experiencing.

The TSB basically states to test the air cleaner assembly for leaks using a smoke machine and to make sure the PCV system is functioning properly. If a leak is found, replace the air cleaner assembly and the piston rings.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 3, 2013, 10:03 AM)

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