I have built vintage and old tractor engines for over 60 years. I have broke engines in on everything from 10w straight weight to s3 diesel oil. This product [Lucas High Zinc Engine Break-In Oil] has so far on dyno break in of flat head Fords give me the fastest ring seal of anything else I have used. I’m not a snake oil fan so if a product passes my tests my customers will hear about it.

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