Making Automotive Dreams a Reality. Mitsubishi Eclipse / Talon DSM. Mitsubishi Evo 8 / 9. Subaru BRZ / FR-S / GT-86. Mishimoto MMOP-EXTFC Universal Gold In-Line Oil Adapter Thermostat. Looking for ideal fluid temperature regulation for your next project? Mishimoto has the answer with our innovative, ingenious In-Line Oil Thermostat. This sleek unit features a perfect blend of both form and function, and is precision-engineered to properly regulate engine oil, transmission fluid, or any other driveline fluid. The Mishimoto In-Line Oil Thermostat is CNC-machined from a single piece of billet 6061 aluminum. Questions about this item? International Buyers – Please Note. We welcome your inquiry!