Radiator Coolent Replacement - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
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#1 (permalink) Old 05-25-2005, 08:41 PM
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I am about to replace my engine coolant. What is the difference between the red and green colour coolants and which one should I use?
Is the BMW brand coolant red or green?
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#2 (permalink) Old 05-25-2005, 09:06 PM
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Initally all coolant is colorless, the manufacturer adds color. Personally I used ZEREX G5 in my 1988 750 as it met all EURO Specifications (check the Valvoline website) and is tons less expensive than what BMW sells.
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#3 (permalink) Old 05-25-2005, 10:33 PM
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OK, Just to clear any confusion up (on my part at least).

The green coloured coolant is nitrite, phosphate and amine free but does contain some silicates. It is a hybrid addtitive - mix of both organic and inorganic additives.

The red coloured coolant is silicates, nitrite, phosphate and amine free and uses organic acid additives.

I am still just as confused.
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#4 (permalink) Old 05-26-2005, 06:01 PM
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BMW coolant is actually a dark greenish blue color. but more blue than green. i guess as lomg as you mix the coolant 50/50 with water is really the main thing to make sure of
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