Thread: green coolant

I did some research on coolants for Series land Rovers.
Coolants for older engines
There is OAT, HOAT and good old ethylene glycol (IAT or CAT)

The colour only tells you what dye they use, not the formulation.
Early OAT coolants caused a lot of problems for older engines so they now have a 'type 2' OAT which overcomes the problems (allegedly).


Major advantage of OAT/HOAT seems to be the extended life. But as stated, if changing from OAT/HOAT to IAT then a good flush is the best recommendation.


Colin

Originally Posted by gromit

I did some research on coolants for Series land Rovers.
Coolants for older engines
There is OAT, HOAT and good old ethylene glycol (IAT or CAT)

The colour only tells you what dye they use, not the formulation.
Early OAT coolants caused a lot of problems for older engines so they now have a 'type 2' OAT which overcomes the problems (allegedly).


Major advantage of OAT/HOAT seems to be the extended life. But as stated, if changing from OAT/HOAT to IAT then a good flush is the best recommendation.


Colin

OAT and HOAT's are still 96+% ethylene or propylene glycol, it's the anti-corrosion package that's different

The OAT Land Rover used (Texaco) was the first of it's type and used a compound known as 2EHA which unfortunately acts as a softener on some elastomer's used as seals which creates leaks.
It also capillaries out a lot more easily than a conventional silicate based coolant and it doesn't appear to like air in the system at all.

OAT's have much better heat transfer than silicate based coolants, but everything has to be absolutely schmick in the cooling system or you'll create headaches for yourself.

I've had good luck with it in a few vehicles but JC and Pat have much wider experience and subsequently hate it with a vengeance, and FWIW I've gone to a HOAT (Cummins-Fleetguard) to minimise any potential problems

Originally Posted by rick130

OAT and HOAT's are still 96+% ethylene or propylene glycol, it's the anti-corrosion package that's different

Thanks,

Should have remembered that from the research...... but it was a while ago.
It was interesting the different info given out by the tech departments of different companies, I'm not sure that they really know the best solution......


Colin

Originally Posted by rick130

OAT and HOAT's are still 96+% ethylene or propylene glycol, it's the anti-corrosion package that's different

The OAT Land Rover used (Texaco) was the first of it's type and used a compound known as 2EHA which unfortunately acts as a softener on some elastomer's used as seals which creates leaks.
It also capillaries out a lot more easily than a conventional silicate based coolant and it doesn't appear to like air in the system at all.

OAT's have much better heat transfer than silicate based coolants, but everything has to be absolutely schmick in the cooling system or you'll create headaches for yourself.

I've had good luck with it in a few vehicles but JC and Pat have much wider experience and subsequently hate it with a vengeance, and FWIW I've gone to a HOAT (Cummins-Fleetguard) to minimise any potential problems

Rick,had overheating issue's with a Cummins powered Genset last swing,pulled the thermostat and it was corroded as was the housing running CAT red OAT.I'm well into double figures now as far as how many times I've seen that. Pat