Here are some oil coolers from aircraft spruce, designed for air cooled engines, the positech 4215 would be plenty for anything under 0-540 in hot climates (or ground level running) cost is $189.00. or type in aircraft spruce in a search and check for yourself. Most any 8 plate (or greater) cooler that is 2.5 inches deep or deeper will do. Experimental aircraft oil coolers will work just as good and cost half the price as FAA approved ones.
Positech Oil Coolers
PosiTech International Incorporated oil coolers are ideal for Experimental aircraft and Light Sport aircraft. Applicable to all Lycoming installations from 4-cylinder O-235 through 6-cylinder IO-540 e...
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08-01285 POSITECH OIL COOLER 4213 EXMPT $164.25
4212 POSITECH OIL COOLER 4212 EXPMT $164.25
4211 POSITECH OIL COOLER 4211 EXPMT $164.25
08-01286 POSITECH OIL COOLER 4220 EXMPT $164.25
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Aero Classic Oil Coolers
Aero-Classic oil coolers are ideal for experimental aircraft and offer superior performance, lighter weight, and lower cost. In side by side tests, these aluminum plate and fin engine oil coo...
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08-00640 AERO-CLASS OIL COOLER 7 PLATE $233.95
08-00641 AERO-CLASS OIL COOLER 9 PLATE $237.95
08-00642 AERO-CLASS OIL COOLER 10 PLATE $239.95
08-00643 AERO-CLASS OIL COOLER 13 PLATE $261.95
08-00644 AERO-CLASS OIL COOLER 17 PLATE $324.95
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