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 Old 04-18-2008, 09:04 AM   #1
 
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might be a dumb question but why use 10w30 when car takes 5w30? advantages?
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 Old 04-19-2008, 08:13 AM   #2
 
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Originally Posted by bova80 View Post
might be a dumb question but why use 10w30 when car takes 5w30? advantages?
Good question, and Crossbow provided an excellent answer. My personal reasons for choosing 10W30 over 5W30 are:
1. Normal shear down
2. Grade reduction from fuel dilution
3. Stability
4. I live in a mild climate with a heated garage
5. I always warm up an engine easy

If I was seeing frequent dips below 20F, I would use 5W30. Mazda specs cars for use everywhere.
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