Well crap... one more thing to add to the immediate list while the clam is off. Good news is I'm due for an oil change and my oil pan gasket is leaking, so might as well rip the whole oil system apart!
I just spent over an hour reading about alternative options (e.g., BOE Rear cooler, Laminova, Setrab, no coolers). Many of the threads are really old and nearly none of them have any data or follow up after install if it made sense to do.
BOE Rear cooler appears like the easiest option as it's a full kit.
Laminova - looks like a PITA to install and I'm not fond of taxing the cooling system even more.
Anyone running no coolers and tracking their car? Does it really get that hot a good synthetic, like Redline 40wt, can't hold up?
2006 Lotus Exige: Avery Matte Graphite wrap, partial built motor (9:1 Mahle pistons, Ferrea Competition valves, ACT Clutch, ARP head studs), REV400, Nitron SAs, BOE QS exhaust, Ultradisc rotors, Moroso Oil pan, Circuitworks oil pump, CF Stuff (Cup Roof, ReVerie diffusor, side scoops, APR air dam, craftsquare mirrors), Worksbell quick release, Odyssey PC625, Morimoto Xenon HID, BOE Rear Oil Cooler, Difflow Aeroplates, BOE Swirl Pot, DaviesCraig EWP, Reversed Heater Matrix