Don't donk F.

On turn 4 of your 8 outs could be tainted. Folding probably is the best. If you assume you get his 2.87 eur always when you hit, you get 16.42% for a call. 8 outs =16%. But, you won't win full stack with 100% frequency, and as I said, 4 outs might be tainted where you lose stack.

Pre I'd prefer a 3bet pre rather than a call.

This flop will typically be much better for villain than it will be for you so I don't like the flop lead. That being said, if you do lead flop then I would just keep betting on turn.

As played, on the turn your equity should be very low since you're even very far most of villain's bluffs and of course doing poorly against a pair. From @MilfGrinder 's math it looks like very best case you break even, every other case it's a losing call. I'd fold.

Preflop call is kinda marginal but doesn't look too bad. 3bet might be better depending on the opponent.

I don't see a reason to donk the flop and I'd even take the check/raise over that play in this spot though call seems to be the way to go.

I'm just folding the turn. This spot is far from ideal with a solid sizing from villain, lack of position (even if you have implied odds it's gonna be super tough to realize them by the river) and two-tone board which might be killing some of your outs and putting you in very unpleasant reverse implied odds situations.

I still call this pre, and 3 bet the weak SC's

As played I agree with not donking. On a flop of this texture if he has anything decent he's going to raise you and make things awkward OOP. Draws are also less profitable OOP so keeping the pot size under control and as deep as possible is to your advantage until you make your hand.

On the turn in a bloated pot OOP I would fold to his bet.