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Hi San
You are a bright fellow technically - suggest you google "MEC bolts"
My conclusion was to do all you mention but pay particular attention to cleaning the threaded holes. Then use green Loctite ,sometimes blue depending on the situation.
ARP have some very interesting reading on this subject.No motor oil - just their moly Assembly Grease with a customised torque figure.
The reason is the torque spec of 10nM for short(long is a different story) M6 bolts is perilously close to thread-stripping torque when bolting into aluminum.
So I use slightly less torque with an old aircraft mech. dial torque wrench.Plus loctite and always a thin s/s washer to prevent galling giving a false reading.
If the threads seem likely to strip or are a vital clamping point I have substituted s/s studs+red loctite .Then it is no risk to use the full spec torque because both nut & stud are s/s thread+ an oiled s/s washer.
S/s fasteners are so cheap and easy to find now on EBay.
I hope this helps.It is just what I do, not saying it is an expert opinion.
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