I used to use Water Wetter in all my vehicles until I read where Water Wetter had increased the opportunity for corrosion. I thought this was odd that a company that specializes in cooling would have a product that could do that but when I first got my car, Erik from LET and I swaped out my HE and we were discussing Water Wetter, he said he would not recommend it and that many MB mechanics recommend a product from DEI. He confirmed what I had read as being his opinion as well. I believe Rob sells the DEI as well.