On the right side of your cases (down around where the rear brake pedal is) there will be a window. Be sure to check it before you start your bike up, your oil level should be close to the center of that window when sitting level (not leaning on the kickstand).
high quality suzuki oil 40:1
The oil to gas ratio for a Suzuki DR 80 would be 1:32. This means that for every gallon of gas that is added, 4 oz. of oil must be added as well.
10w 30
50:1
550 ml
standard 2 stroke oil snowmobile or dirt bike oil
hypo 80-90 gear oil
Can I use 80/90 luca gear oil
32:1
For a 1988 DS 80 the crankcase takes 650ml of 10 w 40 - a nice lady at a Suzuki dealer looked it up for me.
Yes, oil should be put in the crankcase on a 1989 Suzuki RM 250. The proper oil to use for this is a product made by Standard Oil called 80-90W Gear Oil.
40:1