EP stands for 'extreme pressure' and this oil has EP additives that do a better job at protecting the gears. The viscosity of EP90 oil is similar to a w40 oil but with the added advantage of the EP additives.
Extreme pressure additive - Wikipedia, the free encyclopedia
But these scooter gear boxes being really puny and are not under heavy load/stress, should be fine even with a regular engine oil.. EP has more 'masala' in it ;-) and costs same and should last longer (i.e. if you want to keep it for say a year). Like i said better safe than sorry :-)



I'll do all the check up and repairs this weekend!
will keep the points noted for next time...



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