I would hope you know the difference, but diesels come in various "clothes"...there's common rail, or direct inject...my "old" '02 6000 Mahindra is direct inject (air is heated before starting) and starts on just about first rotation every time (even when temps in the 20's F around here)...meanwhile, my 22 year old 7.3L International engine in my F350 may make quite a few rotations before it starts if it hasn't been started in a few days...(only has about 129K miles on it so I expect to get only about another 200K out of it...)...and then there's the old 2 stroke Detroit Diesels....so which do you have? BobG in VA