that's exactly what i do almost every oil change.Except I ONLY use synthetic ATF like MOBIL1 ATF.Reason being a motor gets a lot hotter than a tranny and you dont want some of the trnny fluid in your engine to break down and add to trhe varnish/sludge problem.
Fred, what's a safe amount of ATF to put in the oil before oil change? Seems like if I"m putting in a quart I might want to drain some off first. But then again just running around for an hour or until everything is throroughly warmed up might not cause any rpoblems. I ask because I'm concerned about the oil choices and oil change history of the I30 due to the previous owner. Of course as usual I'm having it switched over to valvoline synpower(my oil of choice
) and it has the high detergents the car needs anyway, but something to just blast out the gunk in a single shot!