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Originally Posted by dknv
Net is, I conclude that M1 15W50 is a good choice for someone that actually uses their WRX.
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That's what's in my baby. I started out with 5W30, but was worried it wasn't affording me enough protection as I started upping the power of my motor, so I figure the loss of power from the heavier oil is worth it for the increased lubrication.
And yes, the 15W50 does effect the cold start. I gotta crank it a bit on cold mornings, and the idle is a little sloppy... 'course, I think the under-drive pulley adds some slop to the idle.