I consume between 1 liter to 1.1 liters less per 100 km (i.e. 7.5 liters at 6.4-6.5 liters / 100 km), so I do 135 km more per tank, with my 1994 Laguna I At technical control I have 0 in CO in accelerated and 0.03 in idle.
Are there other sincere and credible testimonies, positive and negative?
As Delnoram said, there is a good summary, including some tests.
In my opinion, for your car, I would not be surprised that it originally consumes, in which case it is certain that the caps will have an effect, identical to all the bottles found in supermarkets to clean up or metalize the engine.
On the other hand, on a normal consumption car, I have never seen a noticeable effect of caps. When I went on the forum "caps ...", I was also not welcome because of that: with the same engine, I consume as much or less than the others with caps. This is why I think these vehicles overconsume / or are poorly maintained. Not to mention the fact that positive testimonies are often without figures, always agree with the admin, and that the latter censures clean and clear the testimonies of people who have not seen the effect of caps (which says a lot about the mentality of the people who sell this product).
Finally in short, apart from this forum, you will have trouble finding negative testimonials ... And I trust my consumption figures, Capt maloche tests, etc. more than an arbitrary one "30% savings" posted by 3 different people at the same time on a forum whose admin sells this product.
In my opinion caps can be good from time to time, but in the long term I would be wary: their composition remains unknown unlike current products.
La alone one thing we are sure of and certain of the caps is that they generate a good turnover with a product cheap, so inexpensive to produce, whose active ingredient is not protected fromno license (otherwise it would not be secret), and has only been tested by no official body, only testimonials from satisfied users (the others being deleted).
