Sometimes Autozone has them - they can get the oil filters special order too. I order mine online, ********************************************************************************************.
As for weight, here is a guid:
"5W-30 For areas where continuous ambient temperatures get below 32°F/0°C for significant periods of time.
10W-30 For areas where continuous ambient temperatures get below 50°F/10°C for significant periods of time but remain above 32°F/10°C most of the time.
15W-50 For areas where continuous ambient temperatures stay above 50°F/10°C most of the time."
According to the owners manual you are supposed to change the oil every 15,000 miles and the oil filter every other oil change (every 30,000) miles.
Funny thing about the toilet paper, I've heard of some guys that actually do that and it works for them (but i don't know anyone that does that on their Porsche!)
HTH,
Larez2
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