hi all oil question - Ford Truck Enthusiasts Forums

The synthetic or conventional oil thing cracks me up. In no way did the motor sieze because of synthetic.

It would give you an once more power and fuel economy. Not enough to notice but a tinny bit. If you were constantly running it hard Its worth it. I put royal purple in my engine, trany, and rear in my Nissan titan and got a hole 1mpg and it deffinatly shifted better with 9,000lbs behind it.

Synthetic oil lubricates better and lasts longer. It doesn't swell seals like conventional oil does and deffinatly reduces parasidic loss due to friction.

If you had a nice clean engine that doesn't leak or have blowby then I would say deffinatly use the royal purple or any other synthetic pecause you can just replace the filter at 5000 miles ant then the oil at 10,000 miles. But if your oil turns to gunk in 2000 miles, just like mine does, keep using the cheep stuff.