Premium Double Filtered Pure 2-EHN 99, 2-Ethyl-Hexyl Nitrate Cetane Booster. Diesel Additive to Improve Cold Start, Reduce Engine Knock, Improve Performance & Fuel Economy. 5L

I was sceptical at first but researched the product a little before ordering it. I can honestly say I have been so impressed . I added the recommended dose to a half a tank of supermarket diesel in my 2015 Transit van,( 130k miles). The result was quite remarkable, an immediate engine tone change, more power, quicker acceleration and after half a tank of fuel the mpg had increased from 34 to 46mpg. I then did the same dose again to half a tank of fuel and it increased again to 48mpg. The engines running more smoothly too so I have to say 100% prepared to recommend and endorse this product. Ps. So confident in it that I'm now using it in my 2021 mercedes C class amg convertable , remarkably impressive. I'm recommending it to all my friends.

Does what it says on it. Product not not pricey as well.

This is a great product. Totally stinks though! Engine seems to run a bit smoother and accelerates nicely. Not so sure on any fuel savings at this time. But early days

I mixed the first drive 50ml to 25l of fuel and the second 50ml ton50l. It's difficult to judge if this improves mpg because going into winter diesel is subject to winterised fuel which reduces mpg anyway but I think my mpg is roughly that of summer fuel so maybe a very slight improvement over standard supermarket fuel. Subjectively, it appears to ease cold starts and would appear to reduce some of the clatter associated with my diesel engine. I haven't noticed an ill effects. Make sure you wear gloves when you use this as it stinks and is hard to wash off the smell of you get it on you.

I’ve been using this stuff on multiple vehicles for a while now, on higher mileage stuff I’ve been mixing it with a small amount of 2 stroke mineral oil as well. If you use premium fuel regularly, this may not be of any use, but if you often fill up like me at the cheapest / nearest station, a small amount of ehn 99 imo improves fuel economy, engine running in general, cold starts, limits diesel smoke and just an overall appears to give a better running, smoother cleaner vehicle. More so if you have high mileage or older diesels like me. Also, beware of your friends stealing some from you.

Haven't used yet. But reviews sound very promising. Value for money. Ease of use

Good product at a excellent price.

Definitely a noticeable improvement in acceleration and engine smoothness