I am looking for a good oil to use in my Ford Super Duty V-10. I drained the stock oil at 300 miles and placed a mixture of five quarts of MC 5w-20 and one quart of M1 15w-50. I do not trust the 5w-20 oil for hauling loads for long periods of time in any type of heat or with long steep inclines. The motor seems to be happy pulling loads uphill for hours at a time at 3 to 4 thousand RPMs
I'm looking for a good A3/B3 oil. Any thoughts why I should not use Castrol Syntec 10W-40? Or even Syntec 5w-50 ?
Thanks,
Mark
I'm looking for a good A3/B3 oil. Any thoughts why I should not use Castrol Syntec 10W-40? Or even Syntec 5w-50 ?
Thanks,
Mark