[ajftj]

Seems like you are going a bit overboard.

Unless you have some kind of cooling problem, or heater problem, I really wouldn't feel the need to take plugs out of the block.

Use a coolant flush additive and water, fill it up, drive it around making sure your heater is getting good and hot on both feed and return pipes that run along the rocker cover.

Give all your pipes a good squeeze when they are warning up, they should be flexible not crunchy. Crunchy means lined with rust on the inside from age.

After a hot run with the flush solution, get it out, you really don't want that stuff left in there for more than an hour.

Drain it, and if your being particularly fussy, repeat the full and flush with another flush solution. I did mine twice to get it clear, you will never get it completely clear, but you will get it good enough.

Then fill it with premix Nulon green, if you buy it at the right time from supercheap its about $25 for 6L, fill the rest with distilled, drive it till your next service.

Then at service time just dump the coolant and refill to the correct percentages.

My recommendation is based on keeping the cost down, because I'm almost prepared to bet that after you have flushed it, sometime soon you will find something in the system that forces you to drain and refill anyway.

Radiator, thermostat, thermostat housing leaks, water pump, rubber pipes, hopefully not heater.

Just flush it, fill it cheaply, use it, keep an eye on it.