Hi Bounder, I went back to my link to the HFRR test
and discovered I messed up the link, sorry. The link in this post is correct for the HFRR test
performed in 2007.
I now use FPPF additive, and have noticed a difference in overall performance from my Duramax engine and my Cummins ISC engine. I have not used anything specifically for reducing/preventing a sludge problem, perhaps I should buy a bottle of Biobor, just-in-case.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"