01-06-2010, 09:05 PM
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#13 (permalink)
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Retired admin
Join Date: Dec 2008
Location: Winterfell
Posts: 106,613
Drives: Your Wife Crazy
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Quote:
Originally Posted by dad
I don't think you can do that!
From the maintenance car bibles:•If you do decide to change, only go up the scale. If you've been running around on synthetic, don't change down to a mineral-based oil - your engine might not be able to cope with the degradation in lubrication.
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I'm not sure I buy in, sounds like a rumor the oil companies spread to keep us buying expensive oil 
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