[Perfectlap]

1800 A YEAR??? That's crazy man. When I first bought my BoxsterS it barely had 10K miles and Warranty Direct gave me a quote of $4K for four years. I thought it was too steep given the low mileage. I passed and have only had one repair that cost more than $300 (throttle body). Glad I passed on the coverage.
The issue is that when you buy these extended warranties they REQUIRE that you do all the maintenance at the required intervals--that adds up because the dealership charges you an arm and a leg for some really minor things you can do yourself of have an independent Porsche specialist do at half the price of the stealership. If you miss any maintenance they can turn around and void a claim.
That's how they do it.

Personally if the car has more than 60K miles and the previous owner wasn't dilligent about maintenance I might be inclined to buy a warranty. Maybe.
Either way I wouldn't spend a lot on the coverage. If you have a major claim you've got an uphill battle to get paid. You're better off putting the $5K in the bank for a Porsche repair fund.

p.s.
your car should not be leaking any oil beyond a little drop here and there now and then.