Posted by Thack on December 05, 2007 at 18:17:01 from (76.1.220.92):
In Reply to: Winter Oil posted by Steve Mason on December 05, 2007 at 08:57:24:
If you are using a non-detergent oil, you may have a build up of oil deposits and sludge in the engine. The detergent oil will in time clean all (or most) of the deposits and sludge from the engine and you will end up with a much cleaner engine. The detergent oil will suspend the deposits and sludge in the oil. When the oil is drained, the deposits and sludge are drained with the oil. A non-detergent oil works opposite. Sludge and other deposits are not suspended in the oil and settle to the bottom of the pan and collect around the rings. When the oil is drained there still remains oil sludge in the pan and around the rings.
The affect of using detergent oil in a dirty engine is it will give you a much cleaner engine after a couple of oil changes. It will also clean the deposits around the rings. If the engine has a lot of wear, the deposits are probably taking up a lot of the wear space. When the deposits are cleaned away with the detergent oil, you may start using or burning more oil because of the added clearances obtained from a cleaned engine. If you do make the switch, change your oil more often at first to get rid of all the crud that will come loose. The base used in non detergent oil is actually very good stuff which is why it is also used in hydraulic pumps. As to pour point, etc. Non detergent 30W acts more like 20W50...if I recall correctly.
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