There are several oils, usually labeled as racing, or break in, off road oils, that still have the ZDDP zinc designation.
You might find it in some diesel oils, have to check the label for "ZDDP".
And there are additives that can be used, but that will add another $12-15 to an oil change.
The Surf City oil should be a good choice if it is all it says it is. The 30 weight will work for moderate to warm climates. They also offer 10w 40, and 20w 50.
The problem with oils without zinc is the loss of anti wear properties needed for flat tappet cams. This is a real problem with the "muscle car" engines, and the popular small block Chevys that had cam wear problems from the beginning. Add a high lift cam, and high pressure valve springs, there will likely be problems without zinc.
However, stock antique tractor engines are far from "performance" engines. Using non zinc oil will not likely cause the problem encountered with automotive engines. The older engines were designed to run with poorly formulated oils we would never consider using today, and obviously, they survived!
The choice is, will I feel better with the zinc, and willing to pay the price?
Or just use premium grade oil and most likely never have cam wear problem?
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