Originally Posted by mussinc

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...