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fill the gas tank
wash the car
clean the interior
pump up the tires to max. indicated pressure
change the oil and filter
disconnect the battery and attach an automatic tender
kiss it goodbye until spring
Now, I disagree completely with not using stabilizer.
We've got a boat that recently had to have a costly injection cleaning because we forgot to put stabilizer in the tank. The boat gets out twice a year, and each time now when we fill up we add the stabilizer to keep the injectors from getting gummed up with varnish.
We also rebuilt 3 SU carburetors on our '67 Jaguar that had been sitting for 6 months previous to us purchasing the car.
At the bottom of each carburetor's float bowl, there was a nasty varnish buildup, and the jets of the carburetors were so bad that only 1 of the 3 carburetors was actually working right (1 was stuck, and the other one would alternate between flooding or being sucked dry). We're STILL seeing garbage come through the fuel line from the tank, but not as bad as before.
We've got a stock gravity feed fuel filter (basically a glass bowl that is supposed to allow the particulates to settle to the bottom, while the fuel skims across the top) and a good mesh inline fuel filter as well. The car basically sees car shows and the occasional cruise down to dinner at the town center, but that's been about 5-6 times out in the last year. Stabilizer has helped it from getting worse than it is.
Mine sits all winter (6 months) without being run & starts fine every spring & I don't use any stabiliser. However, for longer periods I'd use it as I've had the "joys" of stripping out & cleaning up carbs that have had old gas turn into a thick, slimy mess that clogged everything up.
Try disconnecting & pluging the fuel line, then run it 'til it dies. Works good for me.
I have concerns about the valve springs being compressed for long periods of storage - up to 6 months. Does anyone loosen up their rockers for long term storage?