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Message: <blockquote data-quote="meetoo" data-source="post: 216387" data-attributes="member: 4025">Hi absidian. It's not just the cylinder walls having greater wear before the engine reach operating temp, it's all the moving part including valve train. Also, sludge formation takes place when the oil is cold.The crankshaft bearings do not operate at 90C and are not heated up at idle anyway. Driving gently at below 2500rpm is not comparable to the stress on race engines.Finally, which is more important to look after, the engine or the crankshaft bearing? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>