Coolant adequate for copper radiator and M30 aluminium head engines

From producers perspective:

IAT (Inorganic Additive Technology) - old technology not suitable for aluminum but good for copper based (soldered) - should be exchanged every 2 years
OAT (Organic Acid Technology) - can dissolve solder, so it is not suitable for copper - 5 years lifetime
HOAT lub SiOAT - new version combining IAT (silicon) and OAT (organic acids) - pushing out IAT fluids
NMOAT - for industry machines. Typically universal and compatible with most of materials used in heating/cooling installations. 7 years of lifetime

excellent information;
BTW
do you know where does the BMW coolant type 87 sits in your list ?
 
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this valvoline is HOAT and can be used in Si-OAT aplications
 
Done....


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used bmw 87
mixed at 50% distilled water





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there are few colours for these caps, but as you have not posted a photo i can not tell by the colour
usually a number on it 1.0 BAR means the max pressure; that one is ok

if you take the cap loose with engine warm you are probably not familiar with combustion engines, or you father didnt trained you properly
that is one of the most dangerous things to do in a car, together with filling petrol at night armed with a ligther to aim well to the filling neck

if you did that with engine cold, then you might have a problem

in my experience, a good working engine will increase pressure up to 0,5 or 0,8 bar, and maintain while hot
after stoping engine pressure decreases slowly, and aproximately in an hour returns to zero

the coolant system works at pressure to benefit from higher boiling temps, excessive pressure may mean cyl head damage, low pressure might mean water pump failure

the cap is designed to deal with presure and keep it below 1BAR, if pressure goes higher than that the cap will handle it and throw away coolant
 
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The safety-kleen most violated states:
  • Recommended for heavy duty diesel applications for 3 years/300K miles or 6 years/600K miles with the addition of an extender.

And
  • Prevents corrosion of aluminum, brass, cast iron, copper, solder and steel
  • Provides excellent high-temperature aluminum protection
  • Does not contain Amine, Phosphate and Silicate
Nmoat
The idea of 6 years between coolant changes is very appealing.

John
 
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