One benefit of full synthetic oil is cold weather starting.
Engine Oil
What Engine oil do you guys use in your 6.7's? is it worth the Extra $$ to use the Ford XO-5W40-5QSD SAE 5W-40 Full Synthetic Diesel Motor Oil. they sure are proud of that stuff it's quite a bit more $$ then the good ol Rotella T6. any pros and cons?
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