Re: I guess I don't understand your comment. - Saab 9-5 Bulletin Board - Saabnet.com
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Re: I guess I don't understand your comment.
Posted by Jay Son (more from Jay Son) on Mon, 28 Jan 2008 17:41:37
In Reply to: Re: sludge and 110,000 miles, kevphill, Mon, 28 Jan 2008 16:28:19
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maybe you changed your driving habits or allowed the thermostat to stick open - that is the only way it could happen if it was clean. I believe good oil changed less frequently is acceptable as long as the car is operated at a high temperature and not allowed to be used fore short trips in cold climates it is better to let it idle to stay hot than to not allow it to heat up. There are lots of reasons for sludge build up and most of them are driver caused and environment. Frequency of oil change will not totally elimninate sludge deposits but engines running cold is a killer. Synthetic oil helps because it doesn't have the acid forming constituates present in fosil oils. Acid+water vapor+low temp =sludge. It is that simple.
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