Hi guys, I used to dismantle the AGR valve at my Ommi (Caravan, 2.5TD, Built 95, 130 TKM) for fun (???) and just wanted to check the hose mounting. The valve inside and also the cracker looks like a coal pit, so that extra filtered air goes through, abundantly stained with Russian deposits. Question 1: is this normal/unobtrusive and does not require any action? Question 2: If it makes any use of anything, how do you clean the crack of Russablagerun? gen? – The exhaust of my earlier 2-stroke moppeds has always been burned out for cleaning, can it be done with a casting part? – Or only once 🙁 Looking for answers – Ludger.