There's a new sort of treated wood out that's dark brown rather than the yucky green. Seems to be way drier in general as well. The green stuff is often quite wet, as mentioned. Not sure why this would be noticeably different. I'm guessing the process is different. Still has that pockmarked business but is more attractive.

I've seen a lot of painted wood rot outdoors, unless it's redwood. Has to be painted regularly or it goes fairly quickly.

I'll second everything about letting the treated dry and then use a primer.

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1986 300SDL, 362K
1984 300D, 138K