Conventional VS Synthetic In The Winter Months

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We don't see much demand for 10w40 these days … often wondered why it's not a common HDEO grade.
 
Originally Posted by bbhero
Interesting points ^^^^^

Many people forget what you are saying in that last sentence.... All oils are allowed to slip a W garde while in service... So a 5w can become a 10w... A 0w can become a 5w...



And gain that grade (or more) back as a result of fuel dilution?
 
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