GL-3 has been superseded by GL-4 which is an upgrade and is backwards compatible for GL-3 applications. GL-5 is not an upgrade to GL-4 and is designed for specific applications. The main issue with GL-5 use in some transmissions is that it is not compatible with the syncros. It should be OK in the transmission on our scoots since no syncros are involved. The synthetic GL-5 is closer to an upgrade to the GL-4 than the non-synthetic GL-5. I feel more comfortable using a GL-4 oil in my scoot since it will do all that the GL-3 oil requires and more.
Post by fairweasel2323 on Sept 14, 2010 11:07:32 GMT -6
I talked to my dealer today he told me that GL-5 would be fine either 75w90 or 80w90 said they use and sell Castrol 80w90. I mentioned about using some Lucas as I have heard good things and have had good use with Lucas oils before and he said that would be fine too but they just use the Castrol so I havent looked at the prices yet but assuming the Lucas is a little more expensive and thats why he said Castrol would be fine?
ok so U prefer a GL-4 better then a GL-5? But ur saying that synthetic GL-5 would be better then regular GL-5? What weight and brand do u use the most that u prefer?
Like I mentioned in my post, the GL-5 oil should be OK in our scoots as there are no synchros. GL-5 is generally the grade of the synthetic oils like Mobil 1 (75W-90) which I use. If using a non-synthetic, I prefer using the GL-4 (any brand name).
I'm fixing to put Royal purple synthetic gear oil in my Znen 250!!! I think it's 75w-90w, but I would use 75w-140w too!!! Don't take me up on it untill you find out!!! I use synthetic 75w-90w gear oil in my harley 6-speed too!!! Redstreak fan!!! lol!!!