Ryobi Riding Mower Takes GL4 80w90 But Can't Find It

Joined
Feb 15, 2020
Messages
820
Location
Florida
My Ryobi riding mower RM480EX requires GL4 80w90 but I can't seem to find it anywhere. Many of the name brands (Valvoline and Pennzoil) have 80w-90 but they seem to be all GL5. Some of the brands I'm not familiar with like VP Classic says GL4 but I'd like to stick with a known name like Pennzoil. And I only need about 8.5 oz. so I'm not interested in buying 3 gallons. Where could I buy GL4 80w-90?
 
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