Adding 10w40 to make higher 10w30 M1

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Why do Mobil's oils thin out so much? Is this something unique to just Mobil 1 or do other oils do this too?
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It kind of bothers me bc I was using trisynthetic for quite awhile and chaning it every 6-7k miles (all highway) and it could have been a 20wt. for sometime.

[ January 22, 2003, 06:21 PM: Message edited by: buster ]
 
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