1/2-20 Time-sert sleeve for oil pan drain ?

The self-tappers are pretty junky. I'm not sure how it got messed up in the first place but the OS self tapper is what stripped out the threads this time. Dummy me tested it on the bench to 30 ft lbs, but without a sealing washer. That difference was enough that it failed at less the 15 ft pounds when installed. :BangHead:

I have double oversize and triple oversize for emergencies but I was looking for better options. I always had treated the OS 1/2-20 with kid gloves until I was able to test it on the bench. But it always dripped 'cause it wasn't close to installed torque.
Agood mechanic I know had suggested Time-sert, but hadn't used it on sheet metal pans.