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Its the valve gear/cam that suffers without zinc. As you dont have a cat converter so you could use it if you could find it. There should be a bit of info on google as to what the zinc compound previously used is. It should be available for other lubrication applications.
I am interested to know more about this "run in" oil. What can you tell us?
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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