5/5 PLO, 1.3k effective
Utg 20, 4 calls, H completes in bb with 6s6d7sJd

Flop 4h6h8c. LJ 120, H calls.
Turn Kc. LJ 350, H calls.
River 2d. LJ all in 750, H calls?
Is H's line ok? V a young unknown, looked capable

I'm folding pre. This isn't a great hand multiway 6 handed and is prone to win a small pot or lose a big pot. set<set. flush<flush, straight<straight, house<house.

As played, I call the flop but then fold the turn.

Given that you then called the turn, then as played that way, I think it is very close between calling and folding the river. The deuce is almost a brick, but not quite if he/she has 35.
Because this is a limped pot pre, the low and middle cards are well within the villain's range.

If you're set on playing 6s6d7sJd pre in this spot, you are better off coming in for a raise. This will usually thin the field and you will more likely have defined the player(s)
ranges who are left in, making 57xx 35xx and 88xx a lot less likely as their holdings.

Personally, I just pass pre and I would only play 6s6d7sJd pre as 3 bet in position/late position, occasionally, to balance my 3 betting range with my stronger 3 bet hands.

fold every street

fold pre if possible
flop call is dicey since not sure how many players are between you and the LJ,
fold turn
fold rvr

Fold pre.

Hero line is viable. Villain could certainly have bluffs with both the 7 blocker and flush draws.

I lean towards betting the flop - Hero has the best hand quite often and wants to deny equity.

If Hero has decided to go with this hand, check-jam turn is also an option.

+1

As others have mentioned this is a fold pre for the exact reason this hand reflects. You don’t want to play small pocket pairs to avoid getting into under set situations. And in this case your flopped set isn’t even the second nuts.

Also your J is useless so you’re playing a 3 card hand where improving possibilities are reduced.