I've always had good luck with Castrol GTX 10W-30, and will probably continue to use it for all of my vehicles. Anyone else have a favorite brand?

 

Mobile 1.

 

You are suppose to use 5w-20 in the new 05/06 Mustangs.

 

Looks like all the new motors are being built with tight bearing clearances and need a lighter viscosity oil ..

 

or it is just a simple way for Ford to squeze a tiny bit more fuel mileage out of their cars.

 

Whatever's on sale! (years of driving a Honda does that to you)

 

Mobil 1 EP in anything that I care about. K&N oil filter as well.

 

valvoline 5w30 full synthetic in the mustang, and valvoline maxlife 10w30 in the ranger.(can you tell i sell valvoline at my store, lol)


and most companies are beginning to switch back from 5w20 to 5w30 now, dont know why, but its only been a couple years that 5w20s been widely used and i guess maybe they are beginning to see problems already, most hondas are back to 5w30s and some fords. id stick with 5w30 personally.

 

Love my Mobil 1 Synthetic.

 

Im a strong advocate for M1, but have been thinking about making a change to something else. My rule of thumb for the smurf is to use 1qt for every thousand RPM I spin. (shift at 6500, so I run 6.5quarts)