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  1. J

    Cummins QSB oil viscosity recommendations

    Looking at the engine operators manual of a QSB 6.7 I operate, and they list 10w30 at a lower ambient operating temperature than 5w40. Can anybody elaborate on this? Does 10w30 really have a better CCS than 5w40? Seems backward to me but there has to be some reasoning here. I trust anything that...
  2. J

    DIY oil bypass

    I am in the process of piecing together my own oil bypass system for my Dodge pick up. I had some trouble locating a bypass head with 1"-16tpi on the filter head that is needed to run the EaBP100 filter but I managed to find one on ebay. It came with a few extra ports which was one of my...