Wanted: better accelerated aging test for lubes impact on diesel particle filters

Diesel Fuel News, June 23, 2003

Lubrizol, Scania and JohnsonMatthey reported in a paper (SAE 2003-011963) to SAE fuels/lubes conference in Yokohama that doping fuel with 0.2% concentration of lube oil in order to accelerate aging evaluation on diesel particulate filters (DPFs), oxi-cats and SCR was only partially successful. Reason: Too much lube oil ash (from a high-ash oil) clogged the DPF too quickly (only 27 hours), before investigators could get complete durability data on the impact of lube components on DPF activity.

However, the results are a further warning that fleets should never dump used oil into diesel fuel for engines equipped with DPFs, they reported. Meantime, the investigators found that lubes components including phosphorous, zinc, sulfur and calcium had no significant impact on NO, HC, CO oxidation activity on a continuously regenerating DPF, nor any impact on light-off activity of the DOGs. Nor did these lubes components affect per formance of washcoated SCR catalysts, even over 100,000 km of simulated operation.