I used mercon V plus this cooler. I think it helped alot. There is a slight whine but definitely not like before. For a 15 bucks it was worth a shot. I've gone through 4 pumps and the dam lines were hotter than hell. I will eventually move to a bigger cooler. For now this little guy help. I'd recommended trying a bigger one. I did use this along with the oem cooler too.Did the cooler fix the whine? Fighting that on a new pump right now and it does not seem to matter what fluid I use.