3800 Series II Oil Leak - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-18-2009, 04:30 PM   #11
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Originally Posted by mussinc View Post
I have a 98 Bonneville SLE with a 3800 series II engine, the engine has about 110,000 miles on it and it runs great. Last year at about this time I had to have the upper intake replaced for failure, which was not a big deal because I was just reimburssed the entire amount for labor and parts from GM due to a recall. Now, this year I have a cronic oil leak which I never had before. The oil is coming from somewhere around the underside where the small platic cover is on the bottom of the flywheel between the oil pan and the tranny, but I cannot see exactly where it is coming from. I dropped the oil pan and replaced the oil pan gasket hoping that I would get luck, but I did not...go figure. I was wondering if anyone has had or knows of this problem on the 3800 series II engines. According to a mechanic that I talked to today he told me that the upper main seal is prone to failure. He said he would drop the tranny and fix the leak for $375. Has anyone ever replaced theirs, did you do it yourself, & how involved is it? Did it still leak after repair was complete?
Any help would be much appreciated...
How did you get your money back on the upper intake job? I'm giving up on my Bonneville. I have a 1997 perfect body and interior, 109,000 miles. i bought it in 2004 with 65,000 miles. I did the upper intake job 2 times in 3 months. Then I went to get a brake job and they gave me a "under the table" oil change. then 2 days later i saw a leak while i was at work. i started the car fine and needed to get home. Ten miles up the road, my engine started smoking and i could not go faster than 20 mph. My car has been sitting for a year now. This is my final attempt on this Bonneville. I need help cause I'm about to sell this car and my Chevy which i don't want to do. I'm starting to like Nissans.
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