Was or is your car a wvo or WMO car?
With the diesel now produced as low sulphur I noticed a lot less carbon
and goop build up.
I also run a little cleaner about every 3 tanks.
My big truck has about 460,000 miles on it and it decently clean.
The Benz has about 150,000 and its really clean.
Just curious why some cars goop up and some don't?