Review on Hot Shots Secret HSSTBN32Z Additive by Russ Charmin

I use this on my diesel. Using this with 100% (not full) synthetic and a new 5,000 mile oil filter gives me 10,000 miles before an oil change. It's a great way to save money while protecting your engine. This was my third purchase so 25,000 miles and no issues on a 180,000 mile truck. I use Hot Shot Secret Products and they are great. This TBN amp is no exception.