986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Warm the engine driving or in the driveway?

stephen wilson · 08-09-2012, 10:26 AM

The problem isn't about the load on the engine while idling. Engines don't run as efficiently or cleanly at idle, so it can lead to excessive combustion byproducts in the oil.

Shadrach, you answered your own question. The reason to limit RPM's while warming up is because all of the engine components haven't warmed up, so internal tolerances won't be correct. It's not just a question of having some oil flowing. As far as the 2500 RPM number ( I usually hear 3000 ), I think that's derived from experience and common sense. You can feel it, 4000 it getting to the area I would consider high RPM.

08-09-2012, 10:26 AM	#20
stephen wilson Registered User Join Date: Apr 2008 Location: Southern New jersey Posts: 1,054	The problem isn't about the load on the engine while idling. Engines don't run as efficiently or cleanly at idle, so it can lead to excessive combustion byproducts in the oil. Shadrach, you answered your own question. The reason to limit RPM's while warming up is because all of the engine components haven't warmed up, so internal tolerances won't be correct. It's not just a question of having some oil flowing. As far as the 2500 RPM number ( I usually hear 3000 ), I think that's derived from experience and common sense. You can feel it, 4000 it getting to the area I would consider high RPM.