We know it's between 2.9 and 3.4, but that might not help you too much. Given its very low VIS100c and VIS40C numbers, I'd suspect that it's closer to 2.9 than to 3.4.
TITAN SUPERSYN SL
Longlife Plus
SAE 0W-30
ACEA A1/A5/B1/B5
VW 503 00 / 506 00 / 506 01
This would be HTHS 2.9 - 3.4.
TITAN SUPERSYN SL
SAE 0W-30
ACEA A3/B3/B4
API CF/SL
MB 229.3
VW 502 00 / 505 00 / 503 01
BMW Longlife-01
PORSCHE
This one would be HTHS >= 3.5
TITAN - Automotive Lubricants