Reading on the forums Cat coolant (which is in my truck) and NAPA ELC are the best coolants to use. Went to pick up some Zerex from NAPA to use in a buddies truck and the part number I gave the guy, ZXED1, was meet with a blank look. He said that the G-05 in a gold bottle #3477 was the only Diesel ELC he carried. Is this the correct stuff??