Originally Posted By: Branson304
My personal favorites are the Motorcraft synthetic blend, Pennzoil Gold & Valvoline MaxLife/DuraBlend
Motorcraft is 60% Group III synthetic & Ford has confidence in this oil out to 10,000 miles in some cases. I believe it's an excellent oil.
Pennzoil Gold is a 50/50 blend, I used to run it in a couple of my Ford's & it was always excellent. I followed the OLM to 7,500-10,000 on this oil. Typical Pennzoil quality!
Valvoline MaxLife & DuraBlend are 30-40% synthetic. MaxLife is obviously the high mileage version, but you'll have nothing but good results using it in an engine of any age or mileage. DuraBlend is difficult to find at reasonable cost in my area. MaxLife is basically DuraBlend + high mileage additives. I've had multiple good experiences with MaxLife & had a couple runs of DuraBlend in the '12 F-250 when it had 10,000-20,000 miles.
How do you knowvthese percentages, have a link to share?