carspark

u should always go by manufacters spec i mean 5w30 wouldnt kill it but over time it could cause more wear then using the regular spec

1low03gt

Same here.

fast Ed

iTrader: (1)

The internal engine parts didn't change from 2000 model year to 2001 model year when they started specifying 5W20 for improved fuel economy. I know this because I can look up the part numbers for rods, bearings, pistons, rings, etc. for any of the engine around that time that were carryover from 00 to 01.

So how is using 5W30 going to cause increased wear? If anything, it will offer better protection for an engine that is being run hard or at consistently high rpms in hot weather, compared to the average driver. On the 2012 Boss 302, they are specifying 5W50 synthetic as used in the 5.4 GT-500, compared to 5W20 for the regular 2011-12 5.0L GT. One of the members on the Corner-Carvers forum is a Ford engineer who helped with some of the design on the 4.6 4V in the Mach I and Aviator ... he specifically stated that he would NOT use 5W20 in a mod motor that is being run hard.


cheers
Ed N.

SNAKEBITE

^^^luckily that does not apply to me re: running hard lol

def67

Thanks for the info Ed, I run my car kinda hard, would it be wise to move up to 5-30? Not tracking it or anything but rev'er pretty good!
Honestly I dont even know what the steeler uses as thats where I get it done but I'd assume they'd use 5-20?

1low03gt

Some good info for sure Ed,maybe i should make the swap to 5w30 since my GT see's some good rpm.

fast Ed

iTrader: (1)

My friend's 07 GT that is a summer daily driver, and sees about 10 track days a year, gets Motorcraft 5W30 synthetic when he brings it in to our dealership for servicing. That is a good weight to go with IMO, still light enough for good protection and getting quick flow up to the heads on a cold start, but enough body for running hard on a hot day.


cheers
Ed N.

1low03gt

Cool,i think i will do the swap when i come to do the oil change on the GT before i start driving it for the season.

Everett

Fast Ed is absolutely right. Ford gets spanked with the introduction of the CAFE laws. 5w30 offers better protection and if you want to go one step better go with a 0w-30 so the oil will get moving at start up quicker. I still laugh at the "do what the manufacturer told ya" comments. Yet ford spec'd 5w-30 for the same cars in the same years in Australia where there are no cafe laws. 5w-20 shears quicker and offers less protection at higher revs. And we all know how these mod motors love to rev. Op forget what these nay-sayers are telling you. An xw-30 is better for your motor