Hi,
As you have a 2.6 I presume you have the later paper element in aluminium canister type of oil filter.
If this is the case, then whatever unscrewing effort you put into it, make sure you use the hexagon on the cap, (mine is 24mm) not the 3/8 square moulded in the end.
I would have thought that a ring spanner on the hex and either a bit of tube to increase leverage, or a clout on the spanner would shift it.
The worst that will happen is the housing may then start to turn, in which case, it may just unscrew the large allen head bolt that holds this part on, or it will slightly loosen it but not continue to undo it.
You would then have to hold the canister body with a strap type oil filter removing tool, and continue trying to undo the cap as before.
I cannot think of anything that would break in the engine block.
Try tapping with a hammer around the end of the filter to try and free the seal of the end cap and the filter body first.
I doubt if it is corroded to make it tight, it has just been overtightened.
The actual oil seal between the end cap and the canister body is an "O" ring which is supplied with the filter.
Roger