quote:The big Harleys have three separate sumps; one for the engine, tranny and clutch. I'm not sure that there is such a thing as special motorcycle additives. The quantity of certain additives and the viscosity may be the key to calling an oil a MC specific oil. Even with the GTX HM and its horrible shearing there was not an overabundance of wear metals in the UOA. Anyway, the Motor Company recommends a HDEO if their brand is not available. The GTX had no diesel rating but the Syntec does (CF, I think). We'll see if there is a difference in the shearing. Irrespective of whether either of these oils is a MC specific oil, this should be a reasonably good comparison of the two.
Originally posted by Dr. T: doyall, is it accurate to compare a motorcycle engine to a car? Aren't you supposed to use a motorcycle oil with special addatives (eg. for dry clutches) and not just OTC automotive oil???
quote:Syntec was a freebie. That, combined with the I-don't-know-what's-going-to-happen-when-I-use-it situation, is why I'm only going to take it to 2,000 miles. Got some M1 V-Twin waiting.
Originally posted by haley10: Castrol often designs in the apparent shear, so it's by design and not a real weakness. Syntec is friction modified and may not be appropriate for use in some bikes. I don't know that Harley or Castrol would recommend it for your use. You should consider running Mobil or Castrol Motorcycle oil, imho. Pricey. but formulated for your application better.
quote:I think he should just start running GC 0w30 in there! But then again, if he starts using GC, he'll be buying it at the same Walmart that I go to, so he'll be cutting into my supply!
Originally posted by Sin City: Dr. T, have you decided which oil you are going to use in your BMW?