Jimbo-
Exactly my thought. It doesn't get cold enough for a 5W oil where I live. The coldest day may only get into the 40*F. If I go to the Sierras, I would change it because it gets one heck of a lot colder. I'm changing the Red Line ever 5,000 miles due to the warranty (I bought the extended). After the warranty is up, I will go 10,000 miles or one year with (UOA's of course).
Thanks for the reply!
PMT-
With the F-150's you can tell which engine you have by looking at the VIN number (the 8th number/letter in). If you have a "W" the engine was made at the Romeo plant (MI). If you have a "6" the engine was made at Windsor (Can). I could be wrong, but I think the Windsor plant only makes truck engines. The Romeo plant produces some of the f-150's and cars like Mustangs, and thunderbirds, etc. You can also tell with the valve cover bolt configuration.
[ June 17, 2003, 07:12 PM: Message edited by: mf150 ]