my head gasket is blown 1992 4 runner do you have to take hole engin out or can i just drain oil and hope all the coolent comes out or do i have to tear the hole engine down

When I do head gaskets all I do is an oil/filter change after repair along with a radiator flush. If an extreme amount of coolant entered the oil I will change oil/filter right after repair then let vehicle idle for thirty minutes or so then change it again while engine is hot. But honestly that might be over kill.

thanks dandy0un you have 4 runner

No. Never had the privilege to own one myself.

O man a privilege A have you ever had any experince with the mixing green and red antifreeez

No. I always try to use the correct kind for the vehicle. But in a tight I have used the kind that will mix with all types.