When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The intercooler only fits in one location. Oil cooler wouldn't fit behind it. My idea is to angle it so that a good amount of air still goes to the radiator.
Have you considered an oil cooler mounted in the wheel arch?
This requires you to cut a duct hole in your bumper but provides clear/cool air straight to the oil cooler without compromising your radiator's effectiveness.
I struggled with my DIY oil cooler after realising than none of the off-the-shelf MX5 solutions was very effective.
I have an MSM and mounted my Setrab STD Narrow 25-row Oil Cooler (L:210mm, H:193mm, D:50mm; 2xM22 connections) behind the fog light (obviously removed the foglight).
It fits in front of the wheel arch liner so is protected from tyre debris and with ducting is effective (8-10*C difference when driving on the highway then coming to a standstill).
Oil cooler mounted behind fog light (blue tube is silicone hose, split and mounted on ducting to seal gaps to oil cooler). Top mounting bracket is 3mm galvanised steel; those three 6mm bolts on the left are the only new holes drilled into the car and screwed into 6mm nutserts,
Right diagonal aluminium bracket mounts to a tie-down hook bolt-point and bottom of oil cooler to provide horizontal stability
.