I don't claim to be an expert, I only share my own observations, based on the wealth of UOA's we have here at BITOG. I do believe that petroleum oils have closed the gap on synthetics. I don't really believe there is much difference in performance between the group IV and V and group II+ and III oils anymore. Castrol and now Mobil now call group III oils "synthetics." The distinction is really blurry...
Terry, I appreciate your not getting as aggravated with me as you do have a right to (based on the tone of my previous post)...
But let me ask you this: How much real world difference can one expect to see in engine longevity (we'll stick with the v-twin Harley Davidson engine to stay on topic) between the best synthetic oil on the market, and say, Havoline 20W50 petroleum oil. I realize that this will only be an educated guess on your part, but you're more qualified than any of us to posit such a guess.
Would the synthetic protected engine last 10 percent longer? Or 20 percent? Just hazard a guess, because I'm genuinely curious as to your opinion on this.
Dan
Terry, I appreciate your not getting as aggravated with me as you do have a right to (based on the tone of my previous post)...
But let me ask you this: How much real world difference can one expect to see in engine longevity (we'll stick with the v-twin Harley Davidson engine to stay on topic) between the best synthetic oil on the market, and say, Havoline 20W50 petroleum oil. I realize that this will only be an educated guess on your part, but you're more qualified than any of us to posit such a guess.
Would the synthetic protected engine last 10 percent longer? Or 20 percent? Just hazard a guess, because I'm genuinely curious as to your opinion on this.
Dan