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I changed mine at about 40,000 miles to Castrol synthetic. I did it early to clear out any metal shavings/particles in the oil - basically being conservative. I ran the Castrol for about 5,000 miles and didn't like it. Poor shifting when cold. At 45,000 miles I switched over to Mobil 1 and it's been okay, a little better.
Understand that you don't really "flush" the transmission so much as drain the old oil out and then put in new stuff, like an engine oil change.
I don't understand the question about the special tool to remove the drain plug though. Disregard what Lil Bastard posted - that tool is for the 5 speed transmission. With the 6 speed transmission from the S you just need a 10 mm allen socket (available at Sears, Harbor Freight, etc.).
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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