WD-40 is not exactly a lubricant, it displaces water (Water Displacement = WD). There are much better options. Plus, WD-40 could harm the bluing/finish on a firearm.
Yes, you can use WD40 but penetrating oil would work better.
no
use it, it is ok to mix
Yes it is ok.
No, it's not OK. You should use at least 5W30. In summer you can use 10W30.
Yes it is fine to use 10W-40 oil
is it allright to use 20-50 engine oil if it states to use 30
you use the 2009 oil which is premium ok ugly
ok, so dont hold me against this if i am wrong, but when cleaning anything like that off an animal, use dawn hand soap. it works, and its safe for the animals ^.^
Yes
No it is OK to go thiner like 0w-20 if there was but not thicker, the oil wont get into tight spots.
Yes, you can certainly use it without an essential oil, but the massage will be so much more effective with it.