NO. It's 5 weight so it can move everywhere and lube everything easily. Especially when it's cooler/cold. AND 5w is environmentally superior because of less friction on the engine (he said, while getting 11mpg around town with his foot stuck through the firewall ).Has any one changed the oil weight in there shelby,ford uses 5w 50 I was thinking of going to 15w 50.
Well, I'm only trying it out for now. I changed to Royal Purple 5w30 and did pick up 4 more RWHP without drastically changing the tune. Just wanted to see what it would do.It has alot to do with the lifters and RPM. 5w so you get no lifter pump up. Some of the fastest mod motor cars at the track run 0w50 oil for this reason. As in 2000+HP cars.
I would be careful if you vary from what FORD recommends and if something happens under warranty and the dealer hasn't changed your oil. You better show some Receipts for what you bought. Just my opinion of course.Stick with what's recommended by Ford - 5W50 synthetic.
Check out K-Mans website $6.59 qt and he'll send out a case as well.I am in the process of having the Moroso 7 Qt. pan pun on mine, along with some other goodies, and they strongly suggested to use the Ford Motocraft oil. I was told that their is an additive missing in some of the others such as Castrol Syntec which I used on my first change. I cannot say what the additive is, but Curtis at Archangel Motorsports, said he had had changed from the Castrol in his own personal GT500 and GT. It's a little pricy (~$90.00)/ case of 12, but I'm taking his advice.
I bought 20 quarts and some filters about 2 weeks ago.Check out K-Mans website $6.59 qt and he'll send out a case as well.