Gear Oil

[Bulldog80]

The manual for my Agility 125 calls  for a SAE 90 weight gear oil, but at the local auto parts stores all the gear oils were multi-viscosity.  I went with the Castrol Hypoy C SAE 80w90 gear oil as that seemed closest to a straight 90, and Castrol generally makes good products.  Any issue with using 80w90?  If so what alternatives are available and where do you get them?

[juice]

The castrol is fine . Enjoy your scoot .

[marioG]

The castrol is fine . Enjoy your scoot .

yeap...

[old geezer]

Thats what I use in my people 150 with no issues what so ever.

[2010Iron883]

Castrol is great. I use Amsoil 80 w 90 syn. It is very clean going in and coming out. I have a little debris on my magnetic plug but not very much at all.

[SteveM]

You might try looking in the marine section as they do sell SAE 90WT gear oil.

[scootergrisen]

No problem in using the SAE 80W-90 if the manual says to use SAE 90 as far as i know.
I also use it.

80W-90 :
80 is the viscosity when cold (-18 °Celsius i think... in the winther).
W = Winther = The oil is good for cold temperature.
90 is the viscosity when warm (+100 °Celsius i think... when the motor is hot and running).

So the SAE 80W-90 is a little thinner then the SAE 90 when cold so it gives less resistance.

I dont know how much this means with gearoil but with engine oil this is used so that it is easyer to start the motor in the winter and the cold oil can be more easely pumped.

So the 80W-90 should only be better then the 90 so i belive its all good.

[axy]

80W-90 :
80 is the viscosity when cold (-18 °Celsius i think... in the winther).
W = Winther = The oil is good for cold temperature.
90 is the viscosity when warm (+100 °Celsius i think... when the motor is hot and running).

80W means that oil in the winter flows through viscometer according to SAE 80 specifications. (W is not winter and does not mean the oil is "good" for cold temperature)
Winter test temperature is from -15 to -40 (for example, SAE 0W is tested at -40 C).
80W-90 means that this particular oil performs according to SAE 80 specs in winter at test temperature for SAE 80 oil, but when warmed to 100 C it performs like SAE 90 spec oil.

[old geezer]

0w, 5w, 10w, etc.is not weight but an somewhat arbitrary rating based on the oil low temperature flow and pumping characteristics - SAE J300 (1999) Motor Oil Grades- Low Temperature Specifications. I say somewhat arbitrary in that an oil that meets the 0w standard can be rated 5w or 10w because of the myth that "W" means weight ( it means winter) and 95-99% of the folks that recommend/sale/change oil believe this myth. We'll all heard "I would not use a 0 weight oil in your car.".

http://www.bobistheoilguy.com/viscosity-charts/

http://mysite.verizon.net/oldhokie/windyridge/oil.pdf