When I used to do old small block chevy lifters, I'd soak them in oil. Probably wouldn't hurt to do the same here, but the important thing is the assembly lube so the wear surfaces mate together properly.

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2012 xDrive35d
2001 BMW X5 3.0i 5MT
and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80
Block Tester