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Message: <blockquote data-quote="FocalPoint" data-source="post: 4331960" data-attributes="member: 2732">Good to hear diverse views on issues like this. Yes, sludge takes quite sometime to build up. For today's motor oils are also called detergent oils. They lubricate and they also clean. However, if the donor engine has already years of sludge within, it will be impossible for even a good detergent oil to clean it up. Engine flush might help but only to a certain extent. It is a stubborn cud down there that somehow clings to the metal after a long period of time due in part to condensation vapour fused to the residues of the combustion process from blow-by and gasket leaks. Such engines are often subjected to very high operating temperatures from the beginning and where oil changes have been notoriously infrequent.We have seen engines presumably using high quality oils from day of leaving showrooms and yet years down the road, there is quite some sludge deposited on the engine internals. In some cases, this sludge has hardened much like roach droppings on metal surfaces.A workshop customer of ours handling mainly recon cars from UK and Japan knows the sludge problem is for real. The irony is that these cars come from cooler climates and hence cooler engines. But they are not spared from the curse of sludge. Even air-cond compressors are not spared too, it seems. It is thus advisable to do a regimental engine and compressor flush. Best still, opening them up and refurbish once and for all like what they are now doing on the automatic transmission box.</blockquote>

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