![]() ![]() Likely it would be part of a Supplementary Coolant Additive (SCA). But if it is required, and any nitrite additive becomes depleted, can it be purchased at retail and added if the antifreeze otherwise tests ok? The above spec makes it sound like OAT NOAT lasts longer?įinally, anybody know if nitrite is even necessary in 71 series?.I think it's required for 53 series, not necessarily 71 series, for cavitation corrosion prevention?. ![]() ![]() I know any formulation should be phosphate and silicate free, to prevent drop out, but I have never seen anything regarding pros and cons among different formulations. Is it smart top stick with a conventional formulation if that's what's been used before.is mixing a small amount of old versus new due to insufficient flushing a problem? When replacing/changing 71 series engine coolant/antifreeze, do any of you have strong opinions about one formulation over another? Among DD approved antifreeze types are conventional formulations, extended life, OAT,NOAT,HOAT, and probably a few others I can't recall at the moment. PH should be about, 8 or 9, which is alkaline (never below 7.5 which would be acid.) Test strips are available. The typical three tests for antifreeze/coolant are PH, freeze point and nitrite level. My nitrite level in my 71 series antifreeze tests low currently.It's a conventional fomulation which meets heavy duty DD spec TMC-RP 329.Ĭurrent Detroit Diesel coolant specs may be seen at (but 53 series and 71 series are no longer listed): Don't not generalize any discussion results here to other engine manufacturers////// ![]()
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