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Archive for June 12th, 2006
oil
Posted by Steve on June 12, 2006
1 how is ultra low sulfur fuel going to effect oil change intervals on pre egr engines?
2 my 03 aset mack engines are calling for a 300 hour oil change interval, at 300 hours the oil is very thick and tar like. have you done any testing on this type engine,and what change interval do you recomend?
two very good topical questions. ULSD which is due to be introduced by the fall of this year, will reduce the sulfur in the fuel from 500 ppm (nominal) to 15ppm. This reduction in sulfur will make life easier for the engine, as will reduce the amount of soot, and corrosive deposits in the oil. However the oil drains because of this change will not reduce.
We have a large amount of experience on the Mack ASET engine, and the 300 hour drain interval you are using is on the high side, dependant on the duty cycle you are using, may be too high.
The very thick nature of the oil suggests that you are experiencing high soot loadings in the oil after this period this could cause longer term problems with wear and sludge build up.
300 hours and beyond is easily achievable, but i would recommend as high performing oil such as Hypuron S, and careful oil analysis to see where you are. Alternatively reduce the oil drains to 200 hours.
