Quote Originally Posted by Shutterbug View Post
very helpful thread... so when you say modern diesel engines nowadays don't need long warmup times... how about older diesel engines from the 90's?
Old and new same principle of lubrication and combustion. At idling the oil pump delivers the oil from sump to the journals, galleries, no need to rev up. Some oil on top of the engine are retained after shutoff because of anti-drain-back-valve built-in the oil filter, this helps in faster lubrication on cold startups. Oil pressure in action can be seen after startup as the oil pressure indicator in the dash extinguish in less than 2 secs.

Just start the cold engine, drive slowly maintaining low RPM until you reach operating temp.