Mercedes-Benz 300 SL Operator's Manual page 137

Fuels , Coolants, Lubricants etc. - Capacities
Vehicle components and their respective lubricants must match
.
Therefore use only brands tested and recommended by us.
Inquire at your authorized Mercedes-Benz dealer.
Engine with oil filter
Model Capacity
300 SL 7.5 l (7.9 US qt)
500 SL 8.0 l (8.5 US qt)
Fuels, coolants, lubricants etc.
Recommended engine oils
137