Engine break-in oil

[JP D17]

I overhauled my D17 (gas). I put in 30wt non-detergent oil for break-in purposes. My question is how many hours should I run it before draining and putting in normal
Oil?
Thanks you

 

[DrAllis]

I'm surprised you were even able to find any non-detergent oil !! I dunno. I never used any break-in oil in the 50+ years I've overhauled those gas engines. Which age engine is it ?? full flow oiling system that used a Fram PH8A style filter?? Or the old bypass cotton string filter like a WC and WD use ??