TVR123

What does everyone think about the approach to getting at most of the fluid through disconnecting the lines and letting the pump push out the old fluid in the TC and cooler circuit? Shut down when fluid begins to show any evidence of a pulse. Then drop pan and change filter, clean up magnets, etc. Then refill and start, allowing some to push out of the cooler lines until a good color change. Then connect everything and check fluid level. Terrible idea risking running pump dry or okay if cautious?

Question for you all. If I drain, change filter, and refill with the Mobil 1 HP LV fluid recommended for my 2018 Colorado 8-speed transmission, will I run into any trouble with the new fluid and old fluid from a compatibility perspective? I am leery of having anyone do a flush, and I don't want to unhook lines and risk running the pump dry on my own. But I am worried about fluid compatibility. The new fluid is supposed to be compatible with the Dexron VI. I am probably being paranoid and over-thinking this.