Originally Posted by
wingracer
Agree completely. In fact, for our high strung onroad motors, I like at least 6% castor. Not 6% total oil but at least 6% castor PLUS some amount of synth. Any less than that leads to early failures. This is why most of the onroad pros are adding castor to Byrons. 9% genII is only 4.5% castor.
Who said that pro driver is only 4.5% castor?
Was it a byrons rep such as ryan godberson?