Originally Posted By: Pontual
I've used the racing formula 10w60 still SF (it had racing flags on the bottle), one fill from 1990 to 1992, ocied for 13k miles (20k kms), including about 60h of offroad riding on that huge oci, lotta city driving and road trips in a Honda XLX 350R, without issues. That was an ignorance moved test. That oci took 2 rear tires. Sold the bike in 93 with about 16k miles, still in great conditions. The oil condition I don't know :xD
The honda dealer installed the oil in the first factory inspection and said it could run 20k miles with syn oil and I belived! That was still the real PAO + Ester stuff, IMO. Didn't felt sheared, too. At lesst The shifting was fine.
I too used full synthetic 10W-60 (Castrol) in my Honda motorcycle (CBR 600). I changed it every 10,000KM for ten years, sold it with 100,000KM on the clock and both the engine and clutch were in great condition.
The oil came out looking clean, clear and fine after 10,000KM with not gear changes issues. I always felt it could have gone a lot further. Back then the Castrol tech people told me the 10W-60 was PAO based.