WYNNS Formula Gold Engine Oil Treatment - Improves Compression & Reduces Wear - Enhances Oil Viscosity & Cleans Engine Internally - 500ml

Fair play, this is actually impressive stuff. It sure how much difference it would make with fresh oil after a change but with existing, older oil it has made a world of difference: engine runs smoother AND quieter (particularly at lower speeds) and there does seem to be a general increase in power. Careful not to overfill the engine when you pop it in, mind.

Good product, self explanatory use and it does what it says on the tin. Definitely reduces oil consumption

I put this in my 2014 diesel car with 96,000 miles, without fresh oil. Oil has about 4000 miles to its name, and it honestly made a difference. I used to be able to hear the diesel clatter echo off walls and parked cars etc, but now it’s nearly non existent. I do believe it runs smoother too, but that may be a placebo. I’ve only just done it so I can’t comment on longevity, but results are immediately noticeable. After putting it in, I’d say I noticed the difference within 10 miles. I also put some in my wife’s 2012 mini because it sounded like a diesel even though it’s petrol, and it has quietened it down quite a bit. It’s not miracle juice, but does help with noise, so I imagine it is doing wonders for the engine. I will see if it helps MPG when I do my 200 mile trip to work next week and update this post if there’s anything to report.

Great price, arrived on time and does what it says, noticeable improvement and quieter engine

Wynn's Formula Gold Engine Oil Treatment. I first tried this product a few weeks ago on an engine that had just clocked 100,000 miles. I did NOT change the engine oil before adding it, as changing the oil alone can make quite a difference to engine performance, and I wanted to see if I could feel any difference in the engine by using the product with the existing oil. The first engine I tried it on was getting a bit noisy, and starting to feel quite tired. We service our vehicles regularly, and always use the best Castrol oils, so I didn't really expect to see too much of a difference, but I was really surprised at the results. There was quite a bit more punch to the engine after adding it. The change in performance still seems to be there several weeks later. After being impressed with the product with the first trial, about a week ago, I tried it on another car we have that has also just crossed 100,000 miles, and again, the effect was very noticeable. The engine seems much quieter and smoother. Finally, yesterday, I added it to a third car that has just 75,000 miles on the clock to gauge the effect. The engine in this car was still running quite well, and this time the effect wasn't nearly as noticeable. The improvement was slight. So my initial impressions of this product are: A) Much to my surprise, it does actually work B) It seems to work better in some engines than others, with higher mileage cars perhaps benefitting more. C) It seems like quite a good deal if you want to add a bit of perk to a jaded engine. Just to repeat, with all three cars, we did NOT change the oil first.

This really did the trick on my high mileage Toyota engine. After adding at the oil change, the engine is noticeably quieter and smoother at idle. Compression in the lowest reading cylinder has jumped up13psi. 1000 miles in and the benefits remain. On this experience, I would highly recommend.

Good product at a great price, does exactly what it says and could save you thousands. Used it in every car I've had and never had an engine problem.

Tried Wynn’s on my Alfa Romeo GT which had 69k on the clock, it had a nice oil change and a bottle of Wynn’s added. The engine seems to run smother and certainly runs well haven’t really noticed any effect on power and no difference whatsoever in fuel economy. Difficult to access really but does feel a little smoother.