That is why I have a timer turn on the preheater 3 hours before I go fly on cold days, and I use oil that contains the Lyco camshaft additive.

The roller cams in Lycos also address the issue. But you have to have a recently overhauled engine to get those.

The best option is to fly a lot so that the cam has residual oil on it at the next start.

Camshafts live a hard life, but most seem to make it to their first TBO with only a little consideration on the part of the operator. But of course some pilots don't make the briefing....

Best of luck,

Wes
N78PS