There's nothing listed on the MSDS that would 'clean' a catalytic convertor or anything else. Just the usual concoction of xylene, acetone, alcohol and paraffin that cost but a few pence.

According to their website it's effective for 'fowling'. Perhaps it's good for shotguns?!

Perhaps the car has recently been on a long blast this year and in the previous year it had just chugged around town prior to the emissions test.

Remember a thread on a forum where the OP was absolutely extatic how well his car was performing after x 1000 miles and x years when all he had done was service it and regularly add snake oil to the fuel tank twice a year at a not insubstantial cost per treatment. Another poster came on who had owned the same car with virtually the same mileage and age and he was also delighted since he had only had the car serviced regularly and never wasted a penny on snake oil.

The OP was not happy having another poster "prove" he had been wasting his money, the argument went on for weeks and the OP would not accept a word against the wonder product he had used.

Do want any double glazing because you are a salesmans dream

Same old names with the same old comments, how predictable haha

The first mention of fuel additives brings them back out of their deep sleep.

I sure the OP did not intend to enter into another snake oil debate but only wanted to relate their findings on the forum after using this particular product and being suitably impressed.

I do agree but if the manufactuer is confident in their product then they need to do some proper independent testing and publish the reports. When they do that then there won't be as much negativity about things.

In Germany and I am sure the UK also there are companies that specialise in cleaning cats they have to have a corrosive materials licence and a high temp operators licence ,I have seen what they do and if you can get the same results from pouring some gold dust into the tank then these firms are wasting their time and customers time and money.All sorts of conditions can give different readings such as ambient temp,fuel,heat,different calibration on machines,different equipment.I have used the equipment in one of our garages and the same car with only two hours inbetween gave two completely different emission readings .

Indeed - could be MOT tester error - not getting the cat lit up, calibration issues with the measurement device, all reasonable explanations.

Very good point Collos25.

Edited by nortones2 on 13/02/2014 at 13:49

I only looked at cataclean because a magazine I have read for years and respect (Car Mechanics) seemed to be very impressed with their findings.

I guess I asked on the wrong forum for opinions on the possible actual cause of my substantial decrease in emissions!

I used to read Car Mechanics way back in the 1960s. I happened to skim through one a month or two back and noted that in a full page article on oil pumps the diagram had arrows indicating oil flow in completely the wrong direction. So much for a) their expertise and b) proof reading and editorial checking.

Cataclean is the name of the product - not a description of its function!

It's a fuel system cleaner like many others. In the Car Mechanics test they took an old car and rolling road tested it. Then treated with Cataclean and retested. An improvement was logged in both power/torque and emmissions.

I used a dose of Cataclean on my wifes recently aquired C1, because the car had only 6k in 2 1/2 years. From what I could see looking down the plug holes there was a reduction in the coke deposits inside the motor and there was a step improvement of 2mpg from the next tankfull. Not scientific nor conclusive, but it would seem to have worked as described. I would class it as an "aid" rather than a wonder cure.

Quote from the guff I am reading "Not suitable for 2 Strokes and non- injection cars". I can understand the 2 stroke element but if it is fuel cleaner why won't it work if you don't have an injection sytem? I should add that the advert includes a large cutaway of a catatalytic converter, this seems odd for a fuel cleaner, expecially once the material has been burned in the engine there won't be anything left capable having any effect on a catalytic converter one way or the other.

Whatever it doesnt do its made a lot of money for someone,and I dont recall anyone proving it works,unless anyone knows different

Possibly, but the EOLYS is about £25/litre and is injected when the DPF signals that it is clogged and needs regeneration and is exclusively for diesels. This stuff is for Cat Coverters and both fuels and is present in the fuel at all times, it is mixed with the petrol. There is nothing in the waffle about higher burning temperatures. It would be interesting to get sight of the RAC "Endorsement" report

Edited by Armitage Shanks {p} on 07/05/2014 at 18:35