Any oil with the SL rating (in the circle on the bottle) should be OK but it's getting hard to find SL oil. Even Rotella (I checked every store in town) is showing the SM rating which indicates no/reduced zinc, the reduction of which has been linked to cam wear. From what I've read the zinc is plugging up catalytic converters so it's being fazed out. I've also read that the oil companies realize that they are making life hard for us old car nuts and are in the process of coming out with lines of oil with zinc for classic cars. I wasn't able to find any locally though. I was finally able to find enough "Costal" SL oil to change the oil in my 38. I'll probably end up having to buy some additive next time. Most folks here seem to be succussfully using multi-viscosity oil from the posts I've read so some 10W30 SL (if you can find it) should do you OK for any season.

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