Great product for my 1995 Mercedes E300D! Been using this products for all of my previously owned diesel vehicles.Unfortunately, the product price is MUCH HIGHER than it was years ago and makes its use very costly for the marginal performance gains.Excellent diesel additive,the best on the market!Saw an increase of 1.5mpg. Some of the best I've used.Diesel fuel has changed for the worst and I tried Redline diesel fuel additive hoping to help stop the valve ping under load.I did see a little less ping but even two bottles per 35 gallons didn't stop the ping when pulling a 12000 lb trailer.A product with the ability to raise the cetane level more than Redline is needed so my search will continue.I can tell the difference after using 85 plus. Not a huge difference, but there seems to be a smidgeon more power, and the see-through fuel prefilter my car uses seems to stay cleaner than before.Used beforeNoticed better performance.I had cold start issues but when I started using this they went away