Here's the simplified story. Silicates (usually found in the green stuff) are very protective for alum., as long as they last. It was feared they didn't last too long, but I understand there is recent research that says they last longer than previously thought. But they are not "long life".
HOWEVER, the Japanese manufacturers hate silicates, feeling they are too abrasive and chew up water pump seals-even hard ceramic seals. They like phosphates, which are good for alum. but not as good as silicates.
HOWEVER, the Europeans hate phosphates, because they know that many/most people use plain tap water instead of distilled. OK, no big problem in most of Japan and the US because we have relatively "soft" water, but most of Europe has ~equal parts of water, calcium and magnesium pouring out of the taps--read HARD water. Seems that phosphates cause the Ca and Mg to turn to tiny rocks--not too good.
What to do? I use distilled water in everything, buy cheap green stuff for use in my American engines, and $$$$26/gal "Toyota Red" high phosphate in my bikes and all 3 Toyotas--2 turbo Supras and a supercharged MR2.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
