Originally Posted by Nyles
I'm not starting a fight and I know there will be people to agrue this and it will never change my mind but all my bikes including my honda 929, 3 yfz 450's (2 o4 models and a newer 09), kids honda 90, honda pilot, and vrod with 10,008 miles today all have had only castrol GTX with absolutely no tranny or clutch issues in any of them.
I will also state that if I knew better I would just buy the stuff thats double the money but I cannot buy something like that when I have no reason. I'm sure there is valid points and I'm sure it does some good but I have no issues with wet clutches with this oil. Not trying to argue just adding to the topic my personal experiences over the last 15 years with GTX product.
Have a question. Are you using 20W-50 by chance? Also, I called up castrol and there is not a friction rating and they do not recommend it for motorcycles since it only has an automobile rating. Is there a reason your not using the motorcycle castrol, or do you just prefer GTX. I ask because I have a case of 20W-50 GTX that has been sitting on my shelf and I am contemplating using it on a 64 panhead instead of wasting money on the screamin eagle brand. HD will not endorse any other oil if you call them.