I had read something similar from other sources a while ago and I didn't think it made sense ?
I always witness older diesels emit particulates when they encounter a load significant enough to drop the rpm's some.
My logic (perhaps misplaced) is that lower rpm's would result in easily encountering a load significant enough to lug the engine and "smoke".
Of course conversely, higher rpm's will pump more overall volume of all gasses through the DPF.
Maybe lower rpm's and lugging elevates heat even though it produces smoke?
I always witness older diesels emit particulates when they encounter a load significant enough to drop the rpm's some.
My logic (perhaps misplaced) is that lower rpm's would result in easily encountering a load significant enough to lug the engine and "smoke".
Of course conversely, higher rpm's will pump more overall volume of all gasses through the DPF.
Maybe lower rpm's and lugging elevates heat even though it produces smoke?