Opti-Lube XPD All-Season Diesel Fuel Additive - Gallon (2 Gallons (Treats 1024 Gallons))

This product is recommended for older diesel engines. My 2003 Silverado 2500 HD has been using it for the last 10 years and the fuel injectors have been going strong ever since. I compared gas mileage with and without the additive and it looks like it’s better by 4mpg better with it. This was a 2 month test tracking mileage and fuel used with and without the additive. A rudimentary test but good enough. Most important was not having any engine problems in the past 10 years. Not bad for a 22 year old 3/4 ton truck with 200k+ miles.

Quality product fast delivery. Will use again

Love this stuff because I know it will help prevent high pressure fuel pump failure of my cp4 pump in my 2026 Ford F250 .

Great all in one additive

Good stuff!

This product was tested and results published by the South Texas Research Institute in Texas. This product was #1 in lubrication improvement for diesel fuel. If you're buy some "secret sause" you might want to do some research. They list around 10 different products, I have a 20 plus year old duramax and love this stuff.

Abusing price, I guess because they know it works, I would recommend opti-lube even though I have use it only a few months, I get better mileage and give me peace of mind, knowing that it is protecting my expensive injection system by lubricating it’s internal parts extending its life . Recommend by the Oil Guru in YouTube ( I own a Diesel truck with a Cummins engine 6.7 )

Can’t speak highly enough about this product. I’m new to Diesel engines , about or not even 7 months. . Definitely notices several things. 1. Ran quieter a little , Not a bunch yet noticeable. 2. Ran cooler also. Having Cetane in it makes the knocks Quiet a little in all RPM range.. 3. Starts energetically anyway, so In near freezing or 95 Heat it starts in about 1-2 RPM’s very efficiently. Definitely noticeable in these points, I HIGHLY suggest use it.

Wow, vraiment surpris, résultat instantané moins de bruit moteur meilleur réponse du moteur merci beaucoup très satisfait

Excellent product at an excellent price

Product is great... Reseller has questionable business practices. Double charged and then ghosted me. Had to contact Amazon to get a refund. Don't trust this company.

I am only giving it 3 out of 5 stars because of the total cost I ended up paying...the cost of the product it self is reasonable but since I live in Canada the shipping cost was very high and then I got a bill in the mail from Fed Ex for another $42 for customs fees, etc. My 2001 Ram 2500 24 Valve Cummins seems to really like this additive but for a total cost of $155 for a gallon I definitely won't be ordering it again. I'll stick with the Power Service and 2 stroke oil mix I've been using for the past 10 years with great results.

Love the XPD. But paying over $50 to ship a gallon to me just isn’t right. Need to find a solution for this please.