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I have the same quad and we're putting 10w40 in it...seems the oil caseing and the rear diff are one.....
10w40
1989 suzuki/lt230e
see the second & third link of this website: cars-transportation.co.cchope you get answer; good luck !
my quad runner 230 has a mikuni carb on it. the only model numbers on the carb are this 35B/10.
Sterling 10.25
80w90 gear oil.
80W-90 GEAR OIL
from amazon.com or type quad enines
80w90, limited slip requires 4 ounces of additive.
Oil 80W90 gear oil remove check/fill plug from differential and drain plug
Grease Lightning!