Any of the cars will be fine, even the Z if you're renting. I'd take the Z or M3 to enjoy the drive up. No chains are required at the moment and stock tires are fine, even summer tires. In southern california, the M3 and Z should always have summer tires....really no need for anything else unless you want better treadwear.
I've actually taking a Z and M3 to the mountains plenty of times (bear or Mt high). If I'm going solo, I'd actually prefer the Z for gas mileage.
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