It catches the crap that is said to be carcinogenic.
But they do fill up - so the solution is to trash it down the motorway and burn it off - releasing all that crap probably.
That or there is a burn cycle that injects fuel into the exhaust to burn it off.
All very environmentally friendly and fuel saving Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
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10th Aug 2014 11:48 am
Yowsah
Member Since: 24 Mar 2013
Location: Aberdeen
Posts: 48
Thanks Robbie, Sloss & angelfire.
10th Aug 2014 2:34 pm
VT6165
Member Since: 26 Nov 2013
Location: Clackmannanshire
Posts: 21
So all in all what is the top 3 guys, i have added redex to my d4 and never noticed a difference, have thought of adding some 2 stroke that others swear by but just not sure, I aint no engine expert so really like getting the facts on this site from those who have done it all over the years and can give own experiences.
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