Originally Posted By: SEMI_287
Well according to the MSDS the 5w30 is a blend of polyolefins and additives. To me that says Group 4.
Before we try to determine base stock based upon an MSDS, I'd like you to check something else from that same site where you pulled the MSDS. Check the Formula Shell PDS. Then check the Formula Shell Synthetic PDS. Do you see any differences? I don't. Their data sheets are in absolute disarray and I wouldn't put the slightest bit of trust in any of them right now.
I'd suggest checking pour point to see if that might point to or away from Group IV. However, that would require checking the PDS. Aside from that, considering that PP and PU aren't Group IV oils, I'd find it hard to believe that FSS is.