I have been running the Dino/Synthetic blend, but above selected xW30 (for some reason the first number is not showing up, but I use a 5W.

INLINE SIX POWER! '95 F150 XL
300 Cubic Inches of Low RPM Truck Torque! And twin-I-beams too!
"Drive a stick young man! There'll be time for automatics when you're old and unable."

See my gallery, just created 9-02.

 

0W30 Synthetic.
Amsoil....got bout 20000 on this oil change.
Gonna change it here inabout 5-7000 miles.
I like the stuff. :-x06

 

TTT

 

Castrol 20W50 in the summer and Castrol 10W30 in the winter, burns/leaks a quart every 800-1100 miles, which is about a month worth of driving. 218,000 miles and still going strong on original engine, no rebuild yet.