h14

20 February 2018 at 11:00 #52669

Regarding Fernox DS3. I long understood this to be the “choice” product for cleaning the cooling systems of elderly cars. I bought some, and found the instructions somewhat vague as to dilution proportions. So I rang their technical department.

Just as well I did. They stated that they now recommend DS40 very strongly, in preference to DS3, for use in “our” cars. In particular, it seems that DS3 is particularly aggressive with aluminium. Furthermore, DS3 is solely a descalant attacking limescale only, whereas DS40 is a cleaner that will remove rust as well as limescale.

I have therefore since bought a tub of DS40. However, at the time, I was on the verge of getting the LG6 back on the road, and postal delay to me in France could not be countenanced, so I did use the DS3, but at a weaker dilution, and for less time in the cooling system than originally planned. It did clear out a lot but a particular memory was how long it took to entirely flush it from the system, judged by the colour of the water. I could see no noticeable deterioration to the aluminium head water outlet.

Hope this helps

Laurence

Colin M34

20 February 2018 at 23:06 #52671

Thanks Laurence

Thanks for you comments. I have always found the Fernox people excellent and resonate with comments about using DS40.

I always descale the radiator using DS3 off the car for the reasons you mentioned.

Can anyone see any reason why we should not run with DS40 in the cooling system for an extended period of time? That would get it nice and clean – just what we need with Meadows engines.

M34