I have 2006 fleetwood flair with 6000 mi need to add oil about every 900mi . I see no leak on the ground or gray or black smoke.Wayne

Moved from Forum Technical Support

If it isn't leaking out, then it is getting burnt out. The cat will take care of that tell-tale blue smoke that you were expecting to see. Had a '97 GMC 350ci. Lost a valve seal, 1qt every 600mi, misfire at idle. No smoke out of the pipe.Do a compression test to see if you have a low cylinder (or multiple low cylinders) to try to pin point stuck/worn rings. Pull the spark plugs to indicate the problem cylinder(s) based on plug color.

check the pvc valve, and clean. also look inside the air cleaner and see if it is oily.

Have you pulled and examined ALL eight spark plugs? This will tell you if it is being burned or not. If it is being burned, the next test is a compression test to determine where the problem is. If the spark plugs turn up clean, then you can start looking for leaks, which will always happen in places that are next to impossible to see, like a rear manifold or valve cover gasket. Also, you need to make absolutely positive that you are putting in the correct amount of oil, per the owner's manual, NOT the dipstick. Some dip sticks are wrong and if you put in too much oil, it may quickly be forced out of the crankcase.

How much oil do you need to add at the 900 mile intervals? You may find that after you get 10,000 miles or more on the engine, oil consumption may lessen.I wouldn't get overly concerned unless the oil consumption becomes excessive.With 80,000 miles on our v10 engine, occasionally I have to add 1/4qt oil or so.Best of luck and safe travels...

gm 8.1 engine | Good Sam Community

MountainAir05
Explorer II
Jun 03, 2013
check the pvc valve, and clean. also look inside the air cleaner and see if it is oily.
boogie_4wheel
Explorer
Jun 03, 2013
If it isn't leaking out, then it is getting burnt out. The cat will take care of that tell-tale blue smoke that you were expecting to see.

Had a '97 GMC 350ci. Lost a valve seal, 1qt every 600mi, misfire at idle. No smoke out of the pipe.

Do a compression test to see if you have a low cylinder (or multiple low cylinders) to try to pin point stuck/worn rings. Pull the spark plugs to indicate the problem cylinder(s) based on plug color.
1492
Moderator
Jun 03, 2013
Moved from Forum Technical Support

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