Probably next weekend going to be changing the pan/filter and fluid on our 2021 JGC. Will be using OEM/Mopar pan and ZF Lifeguard Fluid 8. Would it be better to - 1. Drain old fluid, stick with old pan temporarily, refill, run a bit, drain 2nd time, put on new pan, refill. Or 2. Drain old fluid, install new pan, run a bit, drain 2nd time, refill.