1946 Price list includes quart cans of Servi-Cycle oil. 1950 Price List shows 8 oz. cans of Servi-Cycle oil. 1953 Price List shows 8 oz. cans of Simplex oil. 1936 Owners manual states quart cans of Valvoline Servi-Cycle oil can be purchased from Servi-Cycle dealer or the Valvoline distributor. 1936 oil is put up in sealed quart cans, has a Servi-Cycle label on the can, and is made in two weights - the one is marked "For Summer Use", the other is marked "For Winter Use". In the event you cannot secure this oil locally, use a first class Pennsylvania oil with an SAE rating of 70 for summer use, and an SAE rating of 60 for winter use. Your can might be from 1938-1948?