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the GL ratings are performance specifications, not formulation designations. So a GL-5 may or may not have sulpher in it.
Regardless, a local auto parts store has Mobil 1 75W-90 full synthetic gear oil. I may end up using that, if I can find out if it has sulpher additives or not. The other stoopid thing I did was to use 80W instead of 75W (because that's what WalMart had on the shelf) and it's harder to get it into 1st & 2nd than before the change. I imagine when fall/winter rolls aournd, I'll have to change it anyway.
'17 F150 Crew 2.7; '67 Coronet R/T; '14 Town&Country Limited; '09 LR2 HSE. 44-car history and counting!
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