Originally Posted by schooney
i thought ford did a technical service bulletin stating that all vehicles should use 5w20
i run 0w30 mobile 1 with motorcraft filter
That TSB was not for the 4.0. The 4.0 still is spec'd for 5w30.
Any motor can run synthetic or dino oil. You will get a longer oil change interval out of a synthetic. So if you are happy with doing 3k mile oil changes and do not want to go further...dino is for you. If you drive the same way all the time and want to extend the oil change interval (eventually saving just a few bucks over a few years), then I suggest you go synthetic and do a couple of used oil analysis.
Our Outlander dealership wanted us to do 5k OCIs. I thought that was a bit short, but I stayed with it until the warranty was over. Last OCI at 5k I sent in a sample and for $30 they said I could go to 7.5k on Mobile1/Pennzoil Plat. Next OCI I sent a sample in at 7.5 and they said I could go a bit further if I wanted. With that, I now know that 7.5k miles is a pretty good spot.
The ranger only gets 5k miles on MaxLife as I barely get the engine up to temperature and I'm at work...that puts condensation in the oil and is hard on it.
10w30 and 5w30 will provide the same protection during the summer as when they are up to temperature, they are rated at same viscosity...generally. The first number has nothing to do with the second...but does describe the oil at colder temps. So the 5 will flow better in cold temps than the 10. Some oils (dino vs dino....syn vs syn) within the same weight rating will have slightly different viscosities...but supposedly negligible. As I've read, MaxLife is on the thicker end of the weight ratings. Lots of interesting reading here: http://www.bobistheoilguy.com/forums...s.php?ubb=cfrm