Manny I think you are right about the zddp. I think if the oil film breaks down then the zddp will try and prevent metal wear.
This is off of a different forum:
"OK gents, inasmuch as I DON'T want to start anything here, I think it is my duty to inform you of what I learned not too long ago.
I was a Rotella T6 5W-40 user for a while until I met up (online) with a fellow who seemed to know what he was talking about...first of all, Rotella T6 is NOT a full synthetic oil; apparently, they use a synthetic STOCK, remove the sulfur from some dino oil and get to label it as "synthetic" because of some legal loophole.
To get a 5W oil to reach a 40 rating, requires the use of viscosity additives and these additives (being standard as opposed to synthetic) shear in the transmission. The more additives, the faster the viscosity is reduced due to shear.
A TRUE 10W-40 synthetic will use synthetic as base-stock as well as synthetic viscosity additives which are more shear resistant.
The Rotella T6 also has diminished ZDDP levels (to meet the low-emission ratings) which puts your tappets and cam followers at risk.
I use Mobil Racing 4T (was called MX4T) 10W-40 in my TW200 and haven't needed to adjust the valves in almost 2 years. I just turned over 36,000 km and she still starts easily and purrs like a kitten. I will be using the Racing 4T exclusively in my DR.
When I ran T6 in the TW200, the shifting was notchy and loud, and the valve train made more noise than usual. Even at $20/gal, I won't use it in either bike anymore.
But that's not to say that YOU can't use it in your bike if it works for YOU! Go ahead...it's not my bike!"
Apparently the t6 has low zddp levels but I have yet to prove it. If anyone has info on it please post. Maybe we can sticky this thread? Mods?
2005 Honda Rincon. Stock.
New tensioner, tensioner lifter, cam chain, oil chain, knowledge on how to replace these? Priceless.
Mobile 1 4T lets this quad shift nearly undetectable.
Coming soon: Executioners!
After all, a hole - is a hole - is a hole. Richard Burton "Where Eagles Dare".
Last edited by award; 04-19-2012 at 09:53 PM.