Excessive oil usage

Tiny
THOMD
  • MEMBER
  • PONTIAC BONNEVILLE
2 years ago, I purchased a rebuilt engine from GM (Goodwrench - 3yr / 50K warranty) and had it installed in my 1992 Bonneville SE (a Buick 3800, non-turbo). It now has 25,000 on it. I normally change the oil twice a year; however, this past September (a month before my normal change timeframe) I noticed that the oil was a full quart low (time to add). I ran a regular based oil, the first change, for 1000 miles. All oil after that has been Mobil 1 (5W-30 or 10W-30, depending on the next 6 months of Texas driving temperatures). After I changed the oil, i've noticed that the oil is now being used at the rate of a quart per 1K miles. This seems excessive to me. This car is my wife's daily driver (about 14 miles, each direction). I know this engine 'sat' somewhere for 5 years, before I purchased it (over the net), as the block had a build date of 2000 on it when I picked it up. I understand that I'll have to take it to the dealer for them to check it out, but was wondering if you knew of any problems with these engines. This was my first rebuilt GM engine that i've had problems with. I've purchased 3 'target' engines from GM previously, and they all worked flawlessly. Specifically, I was wondering if you knew of any thing I should check, before taking it to the dealer (e.G, PCV valve (that was a new acdelco when the engine was installed) or cracked seals around the valves, etc). I should state the obvious, there is no oil sitting in my driveway, so I don't believe it is 'leaking'.
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Friday, April 6th, 2007 AT 3:12 PM

4 Replies

Tiny
MCFERRANCE
  • MEMBER
For internal leaks, Valve seals would probably be the most common thing. A sign of this is blue smoke from the tailpipe upon starting the car, especially after it has sat overnight. Another sign of this is blue smoke when leaving off of the gas pedal when going down hill.

Another recommendation is to change the oil about every 3,000 miles (instead of the 6-7,000 you implied) especially since this is driven short distances. Frequent oil changes are cheap insurance.
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Friday, April 6th, 2007 AT 3:50 PM
Tiny
DSHAW
  • MEMBER
1999 Pont. Bonn 103k 3800 no super charge

I have the same problem, and yes when my car sits overnight, it smokes when I first start it out of tailpipe for a few seconds, then quits. I have no oil leaks, but burning oil a quart a week, ( drive 1k miles a week for work). My? Is there anything I can add to oil to help prevent this until I have someone tear apart my engine and replace seals. How involved is it to replace the seals, does the motor have to be taken out of car, or can you take off the head and get to it that way. Just wondering how much this is going to cost me.
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Wednesday, September 19th, 2007 AT 9:04 PM
Tiny
MCFERRANCE
  • MEMBER
It will be easier for me to answer your questions after I find out the specifics.
What year, make, and model is it, what is the engine size, and how many miles are on it?

In the meantime, a good quality engine seal conditioner may help. Some brands of engine oil stop leak have seal conditioners in it. Read the bottle to be sure.
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Wednesday, September 19th, 2007 AT 10:05 PM
Tiny
DSHAW
  • MEMBER
I will try a conditioner tilll I get more info on how to replace the seals. I have a hanes manual but its very vag. Just hope I dont have to take apart the whole engine to replace
Thanks again
Dan
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Thursday, September 27th, 2007 AT 6:37 PM

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