Wondering what size oil lines folks are running for remote filters and oil coolers?

I have AN-12 lines from my pan to my oil pump but I have only AN-10 lines for my remote oil filter. I'm adding an oil cooler in series with the filter so I'll be redoing those lines anyway. Should I stick with -10 or step those up to -12 ?

it kinda depends on the opening sizes of the cooler & your remote. i use -10 to my remote filter, i myself would set up to -12 if it was plumbing in a cooler as well. but thats me. why you adding a cooler?

My remote filter housing and oil cooler both accept up to -12 size fittings.

I'm adding the oil cooler because my oil temps run about 215 degrees and I'd like to get them down to 190 or so.