Well, I just got done with ~5 months of testing other oils. I tried Amsoil 5w30HDD, Amsoil 0w30, and Castrol Syntec 5w30. Of all these oils I still have to say that GC is my most favorite.
Amsoil was nice but I didn't notice anything special. Amsoil is a good oil - only negative price was high... UOA of Amsoil showed a little more Iron than GC.
Castrol Syntec didn't have the nice smell of GC and was a lot darker in color. After a 7,000 mile run of CS the oil smelled like old dino and looked dark brown. Noticed the engine seemed louder and rough with CS. Will be getting this UOA soon.
So last night - drained for a good hour - put GC Gold back into the crank case.
GC Gold on the dipstick looks light green (always hard to get an accurate level) and has always stayed that way - even for 5,000 miles. It never loses it's sweet smell either.
After 150 miles of GC I've noticed quieter starts and softer RPM revs. Engine must be happy
. Now to keep from changing GC out every 3,000 miles. Currently planning on something around 5,000 miles OR until the oil starts to darken.
End Result: GC vs The "Best" out there. GC WINS! I've pretty much settled on GC for my car and future cars.
Anyone else have comparisons/similar experiences? Comments/suggestions?
-Paul