I've got it in my 1996 Honda Accord. I changed to the Redline at about 60,000 miles (previous changes were Z-1) and again at 95,000 miles. I added a bottle of Lubegard Red the first time and the last time added a bottle of Lubegard Black (maybe not even necessary...shifts nice and smooth with both...can't notice any difference). I do a total of 3 drain and fills each time with a few miles between each drain (you're looking at about $100 or so for the fluid if you're going to drain it 3 times). Shifting is MUCH better than it was with the Z-1 plus it's a quality synthetic fluid. I intend to continue using it (although I may extend the next change to 45,000 miles) and recommend it highly...good stuff.