Genuine GM Engine Crankshaft Rear Main Seal – OE Spec, Part #12591866 – Fits Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac (1982-2023)

This is the real deal, a genuine GM rear main seal.

It's an OE spec part, number 12591866.

It fits a huge range of GM vehicles across brands like Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac, covering model years from 1982 all the way up to 2023.

So if you've got a leak at the back of the engine, this is the part you want.

It's a direct replacement, includes just the seal itself.

Backed by a 1-year warranty.

Don't mess with cheap aftermarket seals that leak again in six months—get the GM one and do it once.