Opti-LubeXL Xtreme Lubricant Diesel Fuel Additive: 5 Gallon Pail Without Accessories Treats up to 6,400 Gallons

We use this year round for our diesel. But in the winter time when we blend it we definitely needed something to bring back the lubricity that lost with blended fuel. This fits the bill and gives you piece of mind that you won’t have to worry about your fuel not having the lubricating qualities needed to keep your fuel system in good working order!

You won't notice much until after months of use. My RV has a 6BD1T engine from 1981 and I trust the company and have heard great things.. I'll let you know if it still runs next year.. its been 2 weeks

Excellent product. Noticeable

This is a great additive, and I have used it for years. I thought I would save money by buying a large pail, so ordered from Amazon, price plus the extra for shipping, customs dues etc. Lo and behold, 3 weeks after receiving it, a bill comes through the mail from FedEx demanding an EXTRA fee, of a few cents short of $70. This cancelled out all savings of buying bulk. I was very temoted to simply tear up the bill, but paid up dutifully. Don't fall fir this, don't order this.