Apply a thin coat of wheel bearing grease to the surface of the mating parts, whether that is a crush washer or just the bolt. The grease fills the imperfections in the surfaces and creates a seal without alot of torque.

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2001 E320
1991 350SD 265,000 - SOLD
2000 VW Beetle 1.8Turbo - restored
1997 E320 - SOLD
1988 190E - SOLD
1969 Mustang - SOLD