Yo2slick

Ive always ran Castrol but this being my first F150 Im not sure what Ill run in it.

HoustonRider

Been using Mobil 1 for 30+ years. Lots of vehicles. Never an issue. Won't use anything else.

Millers1504x4

In my truck using Castrol.

shazam

Haunted an oil change hobbyist website for awhile. Found out Motorcraft 5-20 is about as good as anything. Fairly priced, and it protects my extended warranty without a lot of record keeping on my part.

Since this thread is about favorites, I've had wonderful luck with Mobil 1. Based on what I saw on the oil change hobbyist site, though, I would pay the extra 75cents per quart for the extended peformance Mobil 1. Apparently there is a significant difference. Better base stock, apparently.

RLXXI

Motorcraft synthetic blend, been using it in all my Fords for the past 20+ years with no problems at all. Reasonably priced as well. And of course Motorcraft filter.

iFord

I like Valvoline full synthetic, but it's harder to find than Mobile 1, so I use Mobile 1. Definitely like synthetics though!

Reflections Detail

http://www.pennzoil.com/motor-oil/pe...synthetic-oil/

Might want to check this out, test was done by an independant group about 6 months ago.

Pennzoil is running a promotion right now on Ultra and premium

Cheers,
GREG

f150ben3

Valvoline only!

canddmeyer

All of the above^. I've used them all, and nowadays the dino's are so good that synthetic is almost unnecessary. That said, I do like to run synthetic in temps over 100 or below zero, and dino for everything between 0-100. Cold starts in cold weather are so much smoother with synthetic, and in hot weather its just a personal preference. I do however change the oil more often than recommended, never going past 6 months.

PARIAH

I'm thinking with my dipstick, Jimmy!