I use something similar to STP (Motor Honey) when I rebuild and engine. I wipe a thin film on the wear face of rod and main bearings to provide initial lube until oil pressure builds up. I rotate the engine a lot by hand during assembly to help wear in the rings, so the STP like film prevents damage to the bearings. I also put it on the cam wear surfaces during engine assembly.
I rebuild a race engine almost every year for over 20 years and it has worked well for me. However, I have heard that adding it to the oil in and engine does cause a lot of sticky sludge.
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