Coolant confusion:

Prevost Winter Garden put Detorit Diesel Power Cool (Not Power Cool Plus) in my system last year, I had asked for Power Cool Plus, oooops.

So now I am one year into the two year time frame suggested for Power Cool. Prevost manual recommends changing the coolant maintenance filter which I have completed. Here is where the confusion comes in. Power Cool requires changing at 2 years, BUT manual/maintenance filter notes your good for 2 additional years once maintenance filter is changed.

So do I now get a total of 3 years (2years as stated on Power Cool bottle – 2 more years stated on maintenance filter when changed at the 1 yr interval for a total of 3 yrs) or just the 2 yrs as noted on the coolant bottle?