[SRX 700]

Manual calls for Gear oil API “GL-3” SAE #75 or #80. I bought Castriol SAE 75W - 90 "GL-5".

Good enough?

 

[rainbro]

GL-5 rating has a high Sulphur content which is damaging to certain metals, Stick with the GL3. My 2 cents

 

[SRX 700]

Wonder why they would make such an oil that is actually damaging to some metals.

 

[rainbro]

different metals, different lubricating requirements. Google the difference between gl5 and gl3

 

[SRX 700]

different metals, different lubricating requirements. Google the difference between gl5 and gl3

BRP uses GL5 for their chaincase oil. Hmmmmm.

BRP XP-S Synthetic Chaincase Oil At Parker Yamaha.com

 

[yamadad4]

use what you have. yamaha uses gl3, 4,and 5 in all the shaft drive bikes and quads. i cant think of any different materials between the drives.

 

[smokingcrater]

some early GL5 rated oils would become corrosive to 'yellow' metals (copper/brass) when the oil was above 250 degrees. If you hit that temperature inside a snowmobile chain case you have other things to worry about! Also, only the early GL5's had that problem, most newer ones also carry an API MT-1 rating, which is certified not to be corrosive. (an oil must pass ASTM D-130 to be MT-1 certified, of which one requirement is that it isn't corrosive to yellow metals)

But back to the original problem, as far as I know most snowmobile chain cases don't have any copper/brass anyway, but if they did, the Castrol GL5 stuff you bought IS certified as MT-1 also, so it is 100% non-reactive to copper.