been using Amsoil in my Hammer after dumping the OE junk, former owner had the 500 change at the stealers, i needed 2 qts makeup oil until 2,000 miles. i then used a 50% blend of 10-40 + 20-50 Amsoil premium synthetic but since seeing-reading only the signature series oils use PAO base oils + Amsoil's total failure to answer any questions on what base oils they use i "assume" that maybe all their products use the cheaper group III oils, they do not tout PAO as they originally did. called Redline yesterday + asked about using 15-50 or 15-40 diesel with my 2013 Vic Hammer with a wet clutch + they replied no issues but recommended the 10-40 Red Vic is using, + also commented on the different additives used for diesel but not needed in gas engines. being a member with Red Vic i can attest to his helpful posts on the Vic forums. i will be switching to Redline when my Amsoil supply is depleted, not sure what flavor yet. i fully believe in the superiority of real group IV + V synthetic oils + the unseen benefits of using those superior products especially ester based oils
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