Quote:
Originally Posted by sppmo
I think you should use whatever brand oil you prefer. I personally don't think there is much difference in any brand. It's like THD (total harmonic distortion) in stereo equipment. Sure you can measure it but you can't hear it under a certain threshold.
I've had cars where I have not changed the oil in 50,000 miles and have not had a problem. But i'm sure people would say I am nuts. 
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OK your nuts.
I do run the Castrol 10w40 in the Boxster. All my other cars run the oil called "On Sale".