I read the following in Diesel Power in regards to the new Diesel Engines from Cummins:
Low-Ash Oil
Like all '07 emissions-compliant diesel engines with a DPF, the Cummins V-6 and V-8 will need to use CJ-4 low-ash oil. This prevents the DPF from becoming clogged, its more resistant to heat, and produces less sludge and soot than conventional diesel blends.
Historical reference: Back in the late 1950 and early 1960s, International Harvester had problems with engine deposits in their gasoline farm tractor engines. Research determined the hard deposits were due to the type of detergent used in light duty automotive oils of the time. To solve the problem, they had a Low Ash oil produced and sold it at their dealers. Deposits I have seen in TDI intakes and in pictures of CRD, and BMW diesel intakes like the one my Son owns look a lot like the ASH deposits that IH found in their engines.
In my humble opinion, using Low Ash oils that will meet the new Cummins requirements along with use of a Provent type device will reduce or eliminate the intake fouling we have seen. I have no plans to reactivate my Boogie Man Gas Elimination Valve, but I will want to go to a Low ash oil as soon as I can get it at a reasonable cost.
I suspect that as soon as the V6 and V8 engines find a home under the hood, oils that meet the requirements will be on the shelves and sold.
Does any one know if the oil they love currently meets the Low Ash requirement Cummins will require when their engines get on the road
