Green coolant vs. Blue BMW coolant

[akorcovelos]

Is there any major difference? Some say that the Blue coolant resists calcification that can clog up passages.

Is this just marketing on BMW's part to sell the Blue coolant at a higher cost?

I plan on doing my T-Belt soon and was wondering if I should use the more expensive Blue coolant.

I'm sure someone will disagree, but my buddy who is a BMW tech said that in the 80's it did make a difference, but modern green coolent is fine. I have run regular coolent in all but one of my E30s with no problems what-so-ever.

[E30 Cabrio]

Is there any major difference? Some say that the Blue coolant resists calcification that can clog up passages.

Is this just marketing on BMW's part to sell the Blue coolant at a higher cost?

I plan on doing my T-Belt soon and was wondering if I should use the more expensive Blue coolant.