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I have spoken and dealt with many 911 mechanics that don't think SWEPCO provides any real benefit (including the one that rebuilt my 915). However, most agree that it is better not to use synthetic in the 915, but to use a quality 80-90 GL-5 dino fluid. If I remember correctly John Walker, who is beyond reproach, agrees with this. I used SWEPCO after my rebuild anyway, and may use it again (though approx $60 a gallon for non-synthetic fluid seems crazy, if its not really worth it). I use sythetic engine oil as I'm convinced that there IS a benefit to justify the higher cost. SWEPCO I'm still not sure.
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