Opti-LubeSummer+ Cetane Formula Diesel Fuel Additive: Gallon (1 Gallon - Treats 2560 Gallons)

I don’t want to sound like a commercial, but this stuff is really amazing and does what it says. I instantly noticed how much quieter my 6.7 Cummins engine was, it started much quicker and I got 1 more mpg !I recommend getting the pump and a few of there 4oz empty bottles and a long funnel. Most newer trucks have two flaps going into the fuel tank and you’ll need a long funnel to go through bothAccording to the diesel mechanic I use lubrication and great filters are the keys to Long Jevity with the diesel. Obviously I cannot tell what’s going on inside the engine if is being lubricated more or not or if the cetane level in the fuel is going up on the fuel, but so far I am very happy with this product !

Just add 1 ounce per gallon and you’ll be set for life.

I have a 2000 F250. I started using Opti-Lube XPD several years ago after reading results of tests and knowing my ancient trick needed help with low sulfur fuels. The engine was quieter and my mileage went up about 15%. I have used it ever since. I am trying this summer blend which was recommended to me by an Opti-Lube representative since I am not in cold weather. If I am in cold weather I will use the XPD again, but this is much cheaper as you don't have to use as much. I believe in these products and know they work!!

Works well... does improve milage

I use this for additional lubrication for my 02 F250. Engine runs much quiter. I also add 12 oz of 2 stroke oil due to reduced lubrication of newer diesel fuel.

Friend told us about and it really does seem to make a difference on our MPG. And maybe even runs better. (We have a new pickup so hard to tell that part.) But you only use very little, so will last a long time. Because it is expensive

I been a diesel mech for 27 yrs . tried stanadyne,slick diesel,Schaffers, in my 2013 6.7 ford. This is the best for milage. I actually use a mix of option lube XL and summer formula. I run 6 oz. Of XL and 4 oz. Of summer formula. I average 21.7 mpg at 70 mph. Super smooth idle. The XL providedfuel lube and I use summer formula for the cetane boost and cleaning properties. The summer also has lube additive. This stuff does actually work. Its worth the money. The xpd formula is great for all round. I just like extra lube with the XL and summer mix.

I've seen the independent testing results and love this product. Spoke with the manufacturer and they were very helpfull and answered all my questions. I have been using it since I had to replace injectors and inj pump in my 06 Duramax. I use it faithfully with every fill-up, not taking any more chances on new injectors and injector pump. Wish I knew about Opti-Lube years ago. Buy it, you'll be glad you did !!!Use it in my 2015 Duramax now too !!!