anyone recommend a shop that will do oil pan gasket and rear main seal in toronto canada or surrounding area ..
In my opinion, the biggest scam in the turbo Buick world is diagnosing a rear main seal leak?
An oil leak from the bottom of the converter cover is "assumed" by people that are lazy, stupid, incompetent or just plain crooked, and claim a rear main seal is bad or leaking.
I know many owners think it is a rear main leak, and that is fine, but un-excusable for a shop or tech to assume that w/o checking properly.
The method to verify a leaking rear main seal is to remove the converter cover and see if there are radial streams of oil tracks on the engine side of the flexplate from the crankshaft to the outer ring gear.
Having dealt with a few 1000 GN's over the years, this is a rare occurrence.
The stock rubber oil pan gasket can and will leak due to age and heat, but many times snugging the pan bolts will stop leaks there.
My most recent episode this summer was with a local 7K mile GNX which had a "rear main seal" leak.
The simple fix was to tighten the pan bolts, valve cover bolts, and remove the Mobile 1 synthetic oil, replaced it with Valvoline 20W-50 oil, problem cured!