Folding for 1 bet in a MONSTER pot? (40bb final)

[vipon]

I cant figure out what im ahead of on this turn, not sure if the line is to call one and fold to a raise/3bet. Preflop raiser is 30/18. To be honest i doubt im even ahead on this flop. One of the biggest 3/6 pots ive seen though, pretty interesting.

Party Poker 3/6 Hold'em (6 max, 6 handed) pokerhand.org hand converter

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#CC3333">MP raises</font>, CO calls, Button calls, SB calls, Hero calls, UTG calls.

Flop: (12 SB) A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, Hero checks, UTG checks, <font color="#CC3333">MP bets</font>, CO calls, Button folds, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, UTG calls, MP calls, <font color="#CC3333">CO caps</font>, SB calls, Hero calls, UTG calls, MP calls.

Turn: (16 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, Hero folds, UTG calls, MP calls, <font color="#CC3333">CO raises</font>, <font color="#CC3333">SB 3-bets</font>, UTG calls, MP calls, <font color="#CC3333">CO caps</font>, SB calls, UTG calls, MP calls.

River: (32 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, UTG calls, MP calls, <font color="#CC3333">CO raises</font>, SB calls, UTG calls, MP calls.

Final Pot: 40 BB