Originally Posted by STIcandy
I don't understand why so thick? I have a subaru STI that calls for 5w-30. I (and most) of us run 5w-40 and with a proper AOS have no burn off and plenty of protection at the track. I have a hard time believing a 50wt is necessary.
It's a Ford Performance thing. The GT350/GT500 all have 5W-50 listed in the owner's manual, while the US Ford GT manual calls for Castrol Edge Supercar 5W-50, but if not available, Motorcraft 5W-50. It's my understanding that the xW-50 is mainly for the track conditions. After seeing how badly 5W-30 shears out to a thin 20 weight in my EcoBoost V6 engines, I'm more of a believer in a 40 weight for these applications.
I don't understand why so thick? I have a subaru STI that calls for 5w-30. I (and most) of us run 5w-40 and with a proper AOS have no burn off and plenty of protection at the track. I have a hard time believing a 50wt is necessary.
It's a Ford Performance thing. The GT350/GT500 all have 5W-50 listed in the owner's manual, while the US Ford GT manual calls for Castrol Edge Supercar 5W-50, but if not available, Motorcraft 5W-50. It's my understanding that the xW-50 is mainly for the track conditions. After seeing how badly 5W-30 shears out to a thin 20 weight in my EcoBoost V6 engines, I'm more of a believer in a 40 weight for these applications.