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Why synthetic?
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Posted by R. Frist (more from R. Frist) on Sun, 5 Dec 2004 13:52:44 Share Post by Email
In Reply to: Re: changing oil, MI-Roger [Profile/Gallery] , Sun, 5 Dec 2004 07:06:05
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I think synthetic oils are highly overrated. They were developed because they are more resistant to breakdown and it enables car manufacturers to say one can go 10,000 miles between changes. In the same light GM started recommending 5W30 weight back in the seventies in order to squeeze an extra 0.5 mpg out of their fleet average, engine wear be hanged. For my money if you are going to change the oil every 5000 miles one might as well use a good dino oil preferably from Pennsylvania crude. High detergent oils are designed to keep small particles in suspension so they can be dumped periodically. No oil filter will take out the finest particles. Also, most any additive detracts from lubricating qualities of the oil. Note that Briggs and Stratton recommends against using multigrade oils in their lawnmower engines. If I lived and drove only in San Diago I would use single weight oil. I have had Saabs for over 20 years and have used nothing but 10W30 Wolf's Head oil. So far, with the exception of the main oil seal being replaced in one at 220,000 miles, none of the engines or turbos have been worked on and none have required additional oil between changes

R. Frist

1985 900T 5sp 280,000 miles when sold. Still going strong I hear.
1986 900 5sp About 120,000 miles when totaled (saved the life of my daughter).
1994 9000CSE Auto 225,000 miles. Now my son's work car.
1998 9000CSE 5sp 106,000 miles
1999 9-5 Auto 61,000 miles



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