Al Bundy wrote:
> I like your thinking here as a labor saving idea. Remember, if you
> continue this program you will always have at least a tiny bit of the
> original fluid in there. I don't consider that critical though.
> Assuming the 1.5 liter tank is included in the 6 liter capacity then
> you are draining 25% and keeping 75%.
> First change = 75% left of original.
> Second change = .75X.75 or 56.25% of original.
> Third change = .75X .5625 or 42.19% of original.
> So at the end of the year you have less than half the original fluid
> left.
> In the case you describe I think it makes sense. Eventually you have
> almost none of the original.

True, but when would one consider the fluid that was added in the first
and second change "old"?