Is screwing the plug back into the pan before starting the vehicle, then removing it again when the vehicle reaches proper temp really a deal breaker?Thanks, but why didn't Toyota just put the overflow hole a little higher to eliminate the need to keep it idling? They could have simplified the entire process. I think I know the answer to that. Service revenue.
We're talking about maybe 30 seconds worth of work here?
As for the keeping it idling part to check the level, just about every AT vehicle out there has to be idling in either neutral or park to properly check the fluid level. Many of the GM products has this written directly on the dipstick. 99% of the population just pulls the stick when parked with the engine off, not even aware that they are doing it wrong.