Oil stop leak products contain plasticizers, which are able to enter rubber seals and gaskets, making them larger and more flexible.

The rear main seal is a complicated component, but its function is simple: to protect the interior of your vehicle from leaks and keep engine oil flowing.

Fixing the leaking seal entails dropping the exhaust, oil pan, main bearing support bar, and rear main bearing, and then replacing the two-piece seal.

We’re reminded of this when there are oil spots on the floor from a fresh restoration—so irritating! Seal and gasket installation requires the tender touch and close attention of a neurosurgeon.

Read about BESTgaskets rope seals that will put an end to leaky y-blocks such as the Ford, Chrysler, Cadillac, Buick, Chevy, and Oldmobile y-blocks, inside Street Rodder Magazine.