Diesels all ( in my mind) have different starting characteristics.. I"ve got a Perkins here that starts immediate all the time even with frost on the hood.. I"ve got a Detroit that needs a starting fluid sniff if it gets down to 32... Everything is different. Just bought a Case 580C/no oilbath air cleaner..no glow plugs. I look in the manual.. Max crank time 30 seconds on the starter.. Wow, 30 seconds on a diesel starter seems long... I"ve never owned a Case before.. On a 30 degree day would 20-25 seconds of cranking ( blows white while cranking ) then eventual fires off with a puff of black but NO blue at all seem the norm on one of these Case machines? I"ve never owned a Case before so I"m curious if they normally require an extended crank when cold ( fires immediate once started ) before I start worrying... Under 32 degrees if the block heater is not plugged in it needs just a sniff to get going..Never any blue smoke then either...