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.quote:
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???
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.quote:
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.
Castrol Syntec 10w40 VOA courtesy of Motorbikequote:
Originally posted by pbm:
Haley, what makes you say the Syntec 10/40 is "killer stuff". Is it not Gr.3 like the other Syntecs (with the exception of 0/30 GC.)
I think he should just start running GC 0w30 in there!quote:
Originally posted by Sin City:
Dr. T, have you decided which oil you are going to use in your BMW?
Here in Los Angeles, that's their regular price.quote:
Originally posted by red2rebel:
.
Just got back from K-Mart (New Jersey).
Castrol GTX was on sale 5 qts. for $7
.