I drove my 2001 Boxster for 3 winters and put snow tires on it. I never had a block heater and it had no trouble starting at -35C(approx -30F). Several years ago I asked the same question and nobody seemed to know anything about blockheaters on Boxsters.
However my feeling is that this is not a motor that should be operated in really cold conditions. Perhaps it is me or paranoia or whatever but I find the engine is not happy running at really cold temps. Year round in California or spring/summer in the Rockies fine. It is pretty safe to say that operating costs/wear and tear on engine escalate rapidly driving this car in our winters.
Cheers, Guy.
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