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I went with 10W-30. I don't know if there's any reason to try a -40 next time. Maybe a good idea since the car is over 100k miles, and I have a suspicion that it may have been thrashed a bit before I got it. I haven't done a compression test though.

Thanks, this is really clear and explains even more about octane rating than I already knew - I was just recently explaining the basics of octane in an informal class/teaching setting, but I described it as an additive that prevents detonation. I always like to know these details, even if I...

Thanks for all the replies! Just to be clear, at this point I'm not stressing about this since the car is running fine. You guys should have heard some of the people on the Porsche forum when I asked - telling me to drain all 60 liters, "It's the safest thing to do," etc. I just wanted to hear...

I guess I've always been told that old gas turns gummy or to varnish, so I was worried about gumming up my injectors or fuel filter. Is that not a concern, or just not on this timescale/under these conditions?

There will definitely be a few 40+ degree days every summer, so this makes sense to me. I'll keep that in mind for next time.

So why do they list multiple options per temperature range? Is it just basically saying, "Whatever you can get from this list will be fine?"

Only in a couple of mountainous areas - vast, vast majority of people here would never encounter snow or temps much below 0C. Good question, it depends on the auto parts store and the brand. Penrite is an Australian oil brand that seems to sell a huge variety of both weights and additive mixes...

Oh yeah, I can add a couple of additional points: I'm in Australia, and the car had 91 RON gas in it - that's the regular/lowest grade here. No ethanol. And, having read that octane will dissipate over time, I did add a bottle of octane boost/fuel system cleaner before I resumed regular...

I'll start by saying that this question is somewhat academic at this point, because I've now used up most of the gas with no apparent ill effects. But I am curious about others' thoughts on this: I had to store my 1988 Porsche 911 for what I thought would be 6 months, but turned out to be 18...

The last time I was regularly changing my own oil, I owned 1998 and 2003 Hondas. I then moved from the US to Australia, bought 2012 and 2016 Hondas, and no longer had a garage, so I've had the oil changed by my mechanic. Now I have a garage again and it's time for some oil changes, so I pulled...