On the motor mounts, I'm just passing on what the thread said.

On the temperature issue, piston slap is always worse when the engine is cold because the piston/wall clearance is greater. It is possible that in cars with aluminum engine blocks (M112's) the wall/cylinder clearance doesn't decrease with temperature, since the aluminum piston will have a similar thermal coefficient of expansion as the block, so we'll need to retract that statement in this case. In iron blocks, that was always the litmus test on piston slap.

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