question about oil.............viscosity

[rustybronco]

What I HAVE noticed is that the oil breaks down either faster or slower depending on the oil. The royal purple broke down just as quick as the rotella. So that was the one and only time I spent 30+ bucks on oil for my Bike. The other thing I noticed is that my clutch didn't throw a fit over full synthetic contrary to popular opinion/belief. Now the standard grade car (not EC) Castrol I used seemed to break down the fastest. (I'm grading this using the two tells I use to tell me when it's time to change my oil besides mileage and those are top end racket and smoothness of shifting, I don't necessarily change my oil every 2-2500 miles, but rather when the bike tells me it wants it changed.

The one time I used amsoil... http://www.thegsresources.com/_forum/showpost.php?p=882403&postcount=18 . I'll let you know if it does the same on a different bike. also, FWIW, royal purple is a hydrocracked base stock oil just like most any other "synthetic oil" out there; unlike amsoil, motul or redline.

***I don't sell or have any affiliation with the stuff, I'm just saying what it did when I used it.***

 

[Guest]

The motorcycle specific synthetics are supposedly wet clutch safe, so clutches do not 'throw a fit' whilst using them, if the clutch is in good working order to begin with. In my case, new springs were needed....the entire clutch assembly is still the original one from 1982.
I'll second Rusty's finding about the shifting smoothness however...with the Amsoil (blend), it remained smooth right up to the mileage dictated next change.

Tony.

DISCLAIMER: To each his own....use what you will, believe what you will...chances are, any oil you choose today (not EC) will be better than what was used in '82, as lubricant technology has come a long way since (though Ed's point about reduction of zinc levels is well taken).

 

[Nessism]

The newest blend of Rotella is certified MA, which means it's safe for wet clutches. No more excuses for those that need a certification to give them piece of mind.

http://www.shell.com/home/Framework...lla-en/html/iwgen/products/products_home.html

 

[Shin-Ken 1074]

As Ed has stated to ensure you don't have an issue using oil in a wet clutch system use MA certified oil. There are different types of MA rated oil so you'll just have to check which one suits your bike. All genuine MA rated engine oil have the Type MA details listed in a rectangle label on the oil container. For my GS1100 and GSX1100 I use the 15W50 Dino Juice, the specifications listed in the rectangle label are:

JASO T 903-98 (D)
Type MA, API: SG,
Honda Spec

Don't worry about the Honda Spec, its for all Japanese engines. As for the oil temp I don't worry about it, what I do ensure is that I change the oil and filter every 3000km / 1800 miles. With over 400,000 km of trouble free engine wear on the GS1100G I use that data as my measure for oil use and maintenance programming. This oil is priced the same as regular Dino oil here so the costing is not a factor. Cheers.