has anyone done a complete flush and used a HOAT coolant in a RRC v8 ? my jeep has HOAT and you can pretty much forget about it for several years.

I know coolants don’t mix

I have posted in the General forum, but will add … Jeeps have an iron block (not sure about the head) whereas the RR is all alloy & needs coolant changes.

Best to stick with what they came with, as in blue. I think it still lasts 5 years, chances are you'll have to drain it to fix something before it's due a change anyway

Posted on the other thread....

I've read on several fora that OAT can cause leaks and corrode some gasket materials and silicone in older engines; on the other hand OAT corrosion inhibitors are said to provide excellent long-term protection for aluminium and cast iron; but OAT may not be the best choice for older cooling systems that have copper/brass radiators and heater cores!

The main problem appears to be mixing traditional blue/green glycol with the newer pink OAT. Th glycol doesn't mix well with the pink oat stuff and it can form a jelly which can clog the cooling system, thermostat etc. If switching from blue to pink the cooling system and heater matrix must be completely flushed through to remove all the blue/green glycol.

I have a 3.5 efi ex Disco1 transplanted into a 90. I queried the use of pink OAT during the conversion but was told since the engine had been flushed and the rad and cooling system was new it would be fine and 'better' than the blue/green. So far ~1000 miles since the conversion I've not had any issues (?? apart from minor seepage from a core plug, but I don't know if that is a new thing, but the stain is pink!) or noticed any jelly but I'm not convinced it's correct for an older V8..

Further research needed but I'll probably empty, flush and replace with the old blue glycol in the spring.

I think it’s good advice , stick with what is. Better the devil and all that