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I experience problems with slow warming up during winter too. it's natural with an aircooled engine. However it prolongs the "cold start" and thereby puts more wear on the engine components than it would during summer. So in order to get the best protection I use 0W30 in my 3.2. I hope this will help the oil getting quickly around inside the engine when I make a cold start. I don't think this thin oil will help the engine to warm up sooner though. The oil just work better at winter temps than say a 20W-50. When I switched to using 0W-30 in my former car (economybox) I got a slight improvement in fuel consume. Less resistance in the engine I think... My 911 though has the same fuel economy as always...? I drove through summer with the 0W-30 oil without the gauge ever going past normal operating temp. The oil preassure stayed normal too. The car burns only very little oil and oil leaks are rare and tiny.
Unfortunately the only cure for long warming up times is parking the car in a heated garage....which I don't have.
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