CapRayT
Member
I have very little to offer here. But to back up some of what SMCT was saying. I have no personal knowledge about the matter, but I know others that are engine builders that have said the same thing about the Moble oil. But they recomend Dello 400 or Rotella for the zink content, or the Valvoline. One of the biggest things that stuck out in my head had nothing to do with Mobil, but Royal Purple. When i got the rear end for my jeep from East Coast gear, I had the conversation about fluid preference for warranty preference. The response was what ever you are comfortable with except for Royal Purple. He went to explain that was the only oil that would void the warranty and assured me if there was a failure, they would know it was being run. He then went on to explain to me about the difference between synthetic and dino oils. He talked very highly about the lucas products also. The thing he pointed out was why run synthetics. I used the usual response of longer life and less breakdown with heat. He then asked me how often I changed fluids, in my jeep it was a couple times of year because of mudd and water from wheeling. He then pointed out how the fluids will not be in there long enough to get any use out of the extended life, and also that i was not in the race world, threefore probably wouldn't be pushing the limits to create the heat needed to break down the dino oil. SInce that conversation, I run oil. My thoughts are if you change your oil every 3k miles, why pay more for an extended life fluid, especially when there is a chance it will not preform they way you want. SO, i certonally have no professional opinion from the stand point of a big twin, for I have little experience with anything farther than bolting them ina frame, never built them. BUt I am willingt lisen to the guy that does. Thanks for the info SMCT.