Deciding to try Royal Purple - Which Weight? 5w-30 - 10w-40 - 5w-40
05-31-2007, 10:41 AM
#21
I have run nothing but Castrol GTX 10w30 since buyin the car. So for about 33k miles now without a issue. I run it year round. I have not sent in a sample to a lab, but think I'm gonna give it a try. I'd be interested to hear about this oil. Seein as how no one else in this thread has mentioned using it yet.
I thouht about RP, but as other have stated it's just not what it used to be. Now I say this from reading of others personal experiences & tests, not my own.
I thouht about RP, but as other have stated it's just not what it used to be. Now I say this from reading of others personal experiences & tests, not my own.
05-31-2007, 01:31 PM
#22
Originally Posted by idrivefast22
me and my uncle didn't beleive the whole HP gain by using RP either, but we changed all the fluids in his 04 Cobra and his car saw a 5hp increase. We dyno'd the car before we did the oil change, which was Mobile 1 Full Syn, then right after the oil change. I'd show you the dyno sheet but he lives in Houston, TX and I live 12 hours away and he doesn't get on forums. Either way, i'm switching to RP 
RP does excel at controling oil temps because of it's thin viscosity and high shear characteristic.
