There are places that put the blue Locktite on oil plugs. What you definitely don't want to put on a drain plug is the tan/grey Locktite.
If you look at the head of the bolt on the inside it looks like blue Locktite. Either that or a blue colored gasket sealer. Of course Locktite goes on the treads when it is used, not on the inside of the head of the bolt.
Edit: Looking at the photo closer, it does look like that is just one of those composite "washers" instead of gasket sealer or Locktite.

I would never put Loctite on an oil drain plug. They should never come loose if they are installed properly.
That style of plug has a blue washer for sealing.


