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Discussion Starter · #1 ·
I am going to start using synthetic oil for the first [email protected] I am wondering what interval I should change it at. I do not do much towing and when I do it is not heavy hauling. Only oil avaiable to me at this time is 5W-40 Rotella. Durning the summer I will Switch to 15W-40. So my main question is change intervals. thanks
 
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