Sump plate Bolts?

8 ft/lbs (96 in/lbs) is the max for an M6 bolt or screw, but you don't want to use that, not with steel or stainless steel bolts going into 30+ year old alloy cases. You see what happens when you try that. Stripping the threads out of the hole will also be a common occurrence. I use 80 in/lbs. It's more than tight enough, but not so tight that you're stripping things or breaking bolts off.
 
You should be using anti-seize on every external fastener on the bike. Aluminum will corrode to aluminum. I would use anti-seize on them.
 
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