OIL SYNTHETIC/REGULAR OIL????

There are many posts here on this topic, I'd search them out... The bottom line is, that it is better to use synthetics & probably not change the weight which Ford recommends.. stick with the 10W30. Don't expect to go too much longer with the synthetics between oil changes as few of the manufacturers really recommend it. Stay away from brands like Castrol who are marketing synthetics that aren't what you are paying for.

Mobil-1 has a good website with lots of info. Royal Purple and others also have good sites. I spent a ton of time (way too much) on this topic... I decided to go Mobil-1 mainly because it's easy to get (Costco, Pep Boys, any Mobil gas station etc.) and is a true synthetic. I change it twice a year along with the filter.

Hope this helped.

I run mobil 1 5W30, becuase it is the best you can get. Royal purple is good, but there is speculation that it leaves deposites. I would say that it's worth the extra $, and once you go, don't go back.

If you're switching from conventional oil to synthetic in a high mileage motor, beware of future oil leaks, as the synthetic is more slippery and thinner in viscosity. I did this in a motor with over 150,000 miles and developed a small leak that I could never find. If it is an older motor, you might want to stick with conventional as the tolerances weren't as close as newer motors. I know that my friend's 2000 Vette uses synthetic, but my 2003 Toyota uses conventional.

I'll vouch for the leaks. When you switch to synthetics all the gunk that is currently clogging whatever leaks you have, magically starts to disappear. Mobil 1 is what everyone has always recommended to me.

I'm no bearing expert but have been told that especially true in older engine design that bearing tolerances actually took into account the molecular size of motor oil. Knowing the differences in this area between synthetic and dead dinosaurs I can imagine that an engine designed for synthetic lubricant may have tighter tolerances to ensure the effective bearing float actually CAN ocurr.

What do I run: Everyday 10W-30 motor oil, changed every 3000 or 4 months which ever comes first (never have exceeded that milage thing though) Oil looks great on every change.