I have a 85 LTD 1200 trike. I have always use Honda HP coolant. I just drain all the old coolant out of the trike. Is there any other and what kind I should get. The Honda HP coolant jump up to 8.21 plus tax a quart. I have heard others have use regular car coolant in their bikes with no problem. The trike has 151,000 miles on it and hasn't change the water pump except once. The HP pro coolant is good but it have gotten so high.