Stinger, auto oil is fine
if it contains no friction modifiers that will kill the Savage clutch. And if it does have the large levels of ZDDP our old style tappet valve system needs (which none of them car oils do any more).
Too many newbies who try to use car oils get some "energy star" enhancer compounds in their clutch plates and get slippage problems accordingly.
Trying to get newbies to read their car oil cans in detail looking for starburst symbols and additive names and stuff like that got too complicated, so folks found that the diesel oils as a group were 1) cheap and 2) did have the large amounts of stuff we needed as far as ZDDP and detergents and surfactants went and 3)
did not have any of the bad friction modifier stuff that would kill our clutches.
Rotella then went the extra mile and got their oils JASO motorcycle tested and approved (sez so right on the label, JASO MA) and Walmart carries it and if the newbies use that they dodge all the bullets that we know about and they get all the goodies to make their engines last a long time.
White jug Rotella costs around $3 a quart when you punch it in your calculator.
Why in the world are you still opening all them little bitty quart bottles again? Buy the good stuff cheap in the big white jug and jest smile, you know you got some for next time you need it.