I couldn't remember what Cummins used on the older ones. Anyway that's where you're seeing count/ml and soot is listed as percentage just like oxidation, sulfation and nitration. It's been a long time since I looked at a Cat SOS report but I think those are some sizes they used to list. It will give you the number of particles in terms of >4 microns, >7, >10 microns etc. If you have particle counts listed it will give you the size of wear particles in microns. Some Cat labs test particle count and others require you to request the testing. The particle count is a separate category. If you're referring to the 17 in the soot column, that is percentage. Does that mean 17 per ml I don't know how to convert that to a percentage thanks for all the replies it does have a spin on by pass filter all the older cummins did all filters on this truck are Napa gold thanks again The sos sheet says particle count (ct/ml).
