Just discovered our Powertech 17.5 (Kubota) is leaking from 2 freezeplugs. Luckily I have the previous Prevost Mtc invoices and it shows two were replaced in '05. Have a call in to the previous owner to find out why. Spoke to my generator expert at Wrico Intl. and was told the Kubota will not accept generic freeze plugs, they don't fit. Just another "gottcha" to look out for from Prevost Mtc.

Question: Seems like a good time to flush the coolant system. What's the best procedure and flushing product?
Thanks.