The German liqui-Moly mentioned in one of the links is available here:
http://www.amazon.com/gp/product/B0055HS24O/ref=pd_lpo_sbs_dp_ss_2/181-1076624-8818662?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=lpo-top-stripe-1&pf_rd_r=1XGGXVQMDEHFFMEYR1G6&pf_rd_t=201&pf_rd_p=1944687702&pf_rd_i=B004GWUPOE
if you are stumbling through recommendations for 6+speed lubricants the gearbox part number is
Getrag G86/20
The lube spec is: 2.7Lof oil to API classification
GL5 75/90
And it has no factory LSD
PORSCHE 986 BOXSTER TRANSAXLE SPECIFICATIONS – California Motorsports Inc
http://pedrosboard.com/read.php?7,27236,27236
After all the reading,my conclusion is the Shell Spirax/Porsche original fill is the beat choice. It is what JFP recommends.
So the remaining question is where to get the ShellSpirax/Porsche oil for the best price. Well the shipping is a huge part of the deal .So I'll try to find a local dealer.