Greenie said:
I honestly think it's the increased use of Blower Heat Exchangers that is making the dual splash so much more prevalent, the extreme high heat back pressure is boiling the grease on traditional configurations, thus requiring more frequent lubrication cycles, where the dual oil seem to take the higher temps better and at least don't lose their lubrication at high temps.
If you HAVE to gease your blower every week, something is happening to your grease in bad way.
Interesting theory, and a wise answer when a salesperson (not you) is pressed to defend the selection. However, elevated blower case temps are going to cause a myriad of other problems before the grease or bearings are effected. Blower exchangers do not in-and-of themselves add one degree to operating temp. The vacuum level and speed are determinant factors, and not any different than in a non-exchange situation. Moreover, I've yet to see a blower case temp rise to the point where the solution is to lubricate via an oil bath. If the blower case/lobes are actually getting that hot, then you need to do a helluva lot more than just switch to oil to correct/compensate it.