Wynn'sExtreme Diesel System Cleaner - Deep Cleaning Engine Treatment - Restores Fuel Economy & Reduces Emissions - Prevents Turbo, EGR Valve & DPF Issues - 325ml

I have a 2008 diesel Mk7 Transit van & i am sure this stuff makes the engine run smoothly. I put a bottle in when I fill up & i think it's worth using it to help my older engine.

Thus stuff is amazing...adds protection to the engine...have been using this for years and will continue to do so

The product 'should' be the same wherever you buy it. Had a fuel problem on my Land-rover a few years ago and the garage/mechanic advised this (he did not specify the brand) type of product. The issue was that the Land Rover was struggling to start, and struggled to get up to 50; then started spluttering over 50 (this went on for several weeks). I put this fuel system cleaner in with 20 litres of diesel and went for a long drive. The vehicles response initially hadn't altered! Then I switched the engine off and the vehicles computer reset and the problem was solved. Now I put a bottle through the fuel system every year before the MOT (that date is just a reminder for me) and have been driving trouble free since. If it's the first time you have used this, I might suggest checking with your mechanic first, and then put it in with your fuel, drive normally for a few miles (20-30 miles) to get the vehicle up to normal operating temperature, then, as you accelerate (e.g. when joining a motorway) you might notice a bit of smoke coming from the exhaust as the system cleaner does it's job. I'm no mechanic, but I wouldn't advice leaving this in your vehicle for too long (I put it in and take one or two long drives over a couple of days until the 20-30 litres of fuel has gone, then refill the diesel tank). The chemicals in this product dissolve the rubbish/gunk that has built-up in your fuel system, so it might not be good to keep fuel cleaner of this strength in the vehicle too long!

I purchased this product for my 2011 Freelander 2 which had become a bit sluggish and hesitate on the accelerator.I applied the full container to approximately half of a tank. I was mindful that I didn't want it to diluted in a full tank.Within about 100 miles after use, that is when I began to notice an improvement in the engine response and quality of the drive.Previously it would take a couple of seconds for the car to respond to a request for more speed but now it's instant. I've also noticed a reduction in the loudness of my turbo.I can't say that I've noticed my MPG increase but I dare say that is largely due to my driving style.I will begin to use more often and apply every 3-6 month or so given how my car is an older diesel.Happy to recommend.

This seems to work , i do notice a difference in my car and for the better ,would use again without a doubt.

Had Engine light on due to a blocked EGR valve, put this in with about half a tank fo diesel and it took about ~60 miles but got into my car and the engine light has gone! to be determined if it will stay off but so far definityl worth the ~£9 rather then the cost of a mechanic cleaning it. - Jaguar XF Model Year 2017.

I honestly can’t tell you if it made any difference on my car. I’ve used it and it’s no quieter than it was before… that said my car is a high miller and regular use of this product may be of benefit.Good value for money if you what to used on a reoccurring basis.

Noticeable difference, now running smoother and mpg increased too.