Nonimouse Posted March 13 Share Posted March 13 Glycol, OAT and Universal, what are the differences and is it true you can't swap OAT for Glycol? Quote Link to comment Share on other sites More sharing options...
elbekko Posted March 13 Share Posted March 13 There are two that if you mix them, they coagulate and plug everything up, I'm guessing that's OAT and Glycol? Other than that, erm, the blue stuff? 1 Quote Link to comment Share on other sites More sharing options...
Les Brock Posted March 13 Share Posted March 13 Does'nt one of them eat brass ? - OAT ? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 13 Share Posted March 13 I've gone back to using bluecol, everything else seems to turn to mud in my experience. 1 Quote Link to comment Share on other sites More sharing options...
Nonimouse Posted March 13 Author Share Posted March 13 This is for a bulk buy for all the machines down at the farm. One of which is supposed to be OAT but with a 500 hour change (whereas OAT says 5 years on the drum) Really just wanted to get Glycol and change everything out as and when Quote Link to comment Share on other sites More sharing options...
pat_pending Posted March 13 Share Posted March 13 Drain everything, flush with clean water... Refill with the same A/F in everything. Job done. All the time I was working I never saw a problem caused by the wrong A/F, that's not to say it can't cause a problem just I've never seen it in 45 years in garages. I think the td5 is supposed to use OAT, seen plenty on regular glycol. The only thing I'd say is if you use basic glycol, change it, and I mean properly flush it, at least every three years. 1 Quote Link to comment Share on other sites More sharing options...
miketomcat Posted March 14 Share Posted March 14 Do not mix oat and glycol. If you swap, flush the whole system completely before changing otherwise you'll have a jelly mess that can write off the engine. I have been told you shouldn't use oat in a TDI but I did for a while at the recommendation off another mechanic (he gave me 25ltr drum of the stuff) and can't remember why not use it. Mike Quote Link to comment Share on other sites More sharing options...
Maverik Posted March 14 Share Posted March 14 I ran my 200tdi on OAT for quite a few years, but wasn't all that convinced with it, especially after doing the head gasket a few times in relative succession I was gobsmacked to see how the blank water holes had corroded, so I swapped back to Glycol although I've not had the head off to see if its any better, I feel I've had super rock solid coolant temps even when I seriously maxed out when towing some heavy stuff up some big hills. 200tdi would have been spec'd with Glycol from the begging, and td5's would have been OAT - I'd say stick to the closest you can for what the engine was initially designed for. 2 Quote Link to comment Share on other sites More sharing options...
SPendrey Posted March 24 Share Posted March 24 Just to add another angle, what about the Prestone yellow stuff? Claims to mix with anything. I've considered going exclusively to that, but it is quite expensive. Quote Link to comment Share on other sites More sharing options...
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