It varies on the formulation but here are SJ numbers for Chevron to compare with the SL of today if that can be found on their website.
Chevron
5/30-.068
10/30 .068
10/40 .068
20/50 .068> Flash Point 500F
30wt 1.03
40wt .085
The straight wt's are PCMO's not HD's
Phillips SL's are all .08 in those wts except they have two 10/30's,the Turbo 10/30 is .085.
The were just quick easy to post numbers I have.
Of course HD's with the SL designation is a different story,,ranging from 1.0 to 1.6 that I have seen recently.