Quote:
Originally Posted by 20102020
No mot so cannot take it for a run on the motorway.
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I am aware that you cannot do it at the moment because No MOT, but will still answer, because it may help you. This was my answer to someone else with the similar problem, and also the procedure that helped me solve my problem with soot going up and down rapidly and regens happening to frequently from July 2023 to November 2023. Here is the copy & paste of my answer (Don't have time to re-edit now).
Yes, doing the regen on the motorway for 15-16 minutes between 3500-3900 rpms in 3rd gear worked for me. Did it with cruise control on. And when finished, make sure to drive for another 20 minutes fast but normally in 5th or 6th gear at 2000-2200 rpms to cool the engine and let the possible small amount of fuel which may go into oil evaporate (and of course slow in the end before powering off the engine). All that requires planning to catch the start of the regen on the highway. And also MAKE SURE to follow your car coolant and oil TEMPERATURES with diagnostics while doing the regen as described. Did it twice since last November 2023, and the 3rd regen is going to happen in a couple of days (now in March 2024). It will be 6.000 kms since November and everything was fine. Soot accumulation was perfect and slow. In winter my car does the active regen exactly at 2.000 kms driven, because the soot does not reach 25,7 g threshold which starts the regen usually. Probably in winter if it's not too cold we get better combustion cause dense air has more oxygen...
Let me repeat - WARNING - do it at your own risk - and DON'T do it without live diagnostics which follows the coolant and oil TEMPERATURES!!!
My coolant temperature barely crossed 90-91 C and oil reached max at 109-110 C.
I did it twice that way and all was perfect for my car in the last 6.000 kms (since Nov 2023).
Also make sure to use some premium quality diesel fuel. I got Shell V-Power diesel. Did fill it up few times with lower quality diesel and it could have made a contribution to the problem I had before.
I've chosen to try that instead of Forced regen when idling and very pleased about avoiding the engine idling at 4.000 rpms for half an hour...
When 3rd regen comes in a couple of days I will not do it that way, but "normally" in 2000-2500 rpm range, as I believe twice was enough...for now.
Car is now at 260.000 kms and going great.
Please report back if you do it.