Thaddeus

I know that the orange stuff is recommended. Would running the green stuff be a problem, though? That's what's in there now (or remnants, anyway).

Thanks

Thaddeus

Dennis Wilson

The green stuff worked for many years before DexCool became available. Just make sure the green stuff is compatible with aluminum engines. If you decide to switch to the orange stuff, make sure you completely flush the engine of all the green stuff as the two shouldn't be mixed.

Dennis

okbarnett

1/2 prestone & 1/2 distilled water.

Bill Ball

I believe the requirements for specific coolant and distilled water have a lot to do with the high mineral content of tap water throughout Europe. I'm not as as concerned about this where I live, especially since I use a low concentration (25%) of coolant and change it every 1-2 years.

heinrich

It is not good. But not usually fatal. It's more important that the coolant has been changed regularly. Orange stuff is faaaar better. Green stuff creates pitting in aluminium blocks and heads. Not that I've seen any ...

KLR

Is there any issue using the yellow Zerex stuff? It's phosphate free.

Tommy928

The most important thing that you need to know is the coolant must be phosphate-free otherwise crsytals will precipatate out and eat your water pump and plug up your radiator.

jpitman2

My 83 had green in it when I got 3 years ago, and inside under thermostat, water pump, and heater outlet were pristine when opened. Switched to orange dexcool at belt time. I suspect regular changes are important, as well as choice of coolant.
jp 83 Euro S AT 48k

Bill Ball

Same here. I did the WP on my 89 at 90K miles last year (it was original) and it looked brand new inside.

Tommy928

Don't confuss with the Porsche (VW) green coolant which is phosphate free to the Firestone which may or may not be phosphate free. Only use phosphate free coolant in aluminum engines.

pvoth

read the owners manual......phosphate free only
the regular stuff may also ruin the head gaskets....be afraid be very afraid