There were some oil drips along the underside of the oil pan just below the oil plug. When I pulled the 1-1/8" oil plug, I found a thin silver metal washer, what looks like the remnants of an o-ring and copper washer on the plug. The oil pan, head of the plug and the outer edge of the metal washer was painted red, Now on the plug itself just under the plug head and the last thread on the plug is a recessed area that looks like an o-ring could possibly go there. My question is what should go between the oil plug and the oil pan to stop leaks? Is there a preferred part like rubber o-ring, plastic washer or metal washer or a combination of these?

I also plan to use Valveline VR-1 10W-30 racing oil for the zinc content. Is this a good idea?

Thanks in advance for any help.

I’ve been using Valvoline VR1 20W-50 for years in my 312; as far as the oil pan drain plug mine has a plastic O ring/washer. I got it from CASCO years ago, NAPA probably can get one.

1955 312 T-Bird Warwick, NY