I while back I saw an older article (see link below) stating that engine wear increases rapidly at temperatures under 170 F (77 C). What I think is the most damaging to an engine is cold start owing to the pistons expanding faster than the cylinders. I always try to get my engine to temperature a.s.a.p. without revving it over 2500 rpm or so. Also, I believe synthetic oil goes a long way in reducing wear during cold starts. Quite frankly I'm more concerned about hot running engines than cold running ones.
'93 300E 4Matic
'98 Nissan Altima
'00 Yamaha Road Star Silverado
Last edited by renok7; 02-15-2002 at 09:34 AM.