What would be the best oil for a gt? It seems like most of you that use synthetic have GTS. Is there a difference in preferred oil for a GT? Should I be using synthetic for my GT? Sorry if a noob question but just not sure...
It doesn't matter what you have, synthetic wlll always outperform conventional. I guess the reason why you see more GTS people using synthetic is that they take that extra precaution given that their engine revs higher and has a higher compression ratio.
You could sort of sense how your engine is running and how well lubed it is, you know? I felt that my engine was underperforming with the stock stuff...it just felt sluggish. The first time I did my own change I used Quaker State full synthetic and I felt more power and torque being made in lift. Then I used RedLine and then I was feeling my engine barely had to work that hard to get up to lift and then throughout. The power felt smooth. No, I didn't do any dyno tests, but I'm very sensitive to my car.
Since a GT doesn't rev as high as the GTS and has lower compression, you'd be fine with Redline 10W30. That's actually what I use in my GTS right now and it works great. But I have an 02 GTS and I was only going up to 7700 rpm. Now that I have the PowerFC, I might try to see how 10W30 feels at 8500 rpm, and then how 10W40 feels at 8500 rpm, if it helps any or not.
It will take you longer to warm up your car with a thicker oil, but I don't care since I just want Performance. If you are the kind of person to want to get in your car, and go, you should use RedLine 5W30 especially if you live in cold areas where it gets in the singe digits. Personally, I would never go anywhere without warming up my car for a few minutes even on a warm day. Some people are intuitive and some are not. If you are not, then maybe you don't want to use too thick of an oil because you might not feel when your engine is ready to drive. It could me and I could be making too much out of it like a freak hehe, but I really do notice slight changes in my car.