[markas]

Hi Si,

I have used redex for ever since i started driving. On our 850's use the Fuel injector version and if you can afford it, buy the 1 litre bottle and add it at every couple of full tanks.

If you don't drive a lot, it will last you ages but i do so it lasts about 3 to 4 months. Also if i am going to fill up after a full tank in one day, do a double dose to ensure a good clean out on the motorway with along run.

Of course there are other brands like stp etc, and volvo used to clean the injectors as part of the service, i don't know if this is still done though.

The otherthing to note they should be CAT friendly which REDEX is.

hope this helps,

mark with 174k on my 850glt.