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a lot of people seem concerned with anti-wear addititves. show me ONE boxster engine that simply wore out. i think they are few. far more often, substantial & catastrophic damage occurs that is more likely the result of viscous breakdown at high temperature. IMO, this is a direct result of low 'W' weight base stock that is used to improve fuel mileage.
0W and 5W oils use light base stock. additives are used to thicken it at higher temps. OEM's choose these because they help the manufacturer achieve CARB standards for fuel mileage.
my vote is, and always has been, to go with a thicker base stock & worry less about startup wear. FYI, racing motor oils tend to be single viscosity, heavier weight oils. there is a good reason for this.
i use castrol 20W-50. if my car didn't see the track, i'd probably use 10W-40. ZDDP is a bonus, but i think thicker oil = longer engine life for us.
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