Tomioka Racing TR Temperature Controlled Oil Cooler Kit for 2015+ Subaru WRX

Q: Will this overcool my WRX in winter?

No. The thermostatic plate bypasses the core until ~180°F, so warm-up remains normal and the cooler only engages as needed.

Q: Do I need tuning after installation?

No. The kit manages oil temperature and does not alter ECU calibration.

Q: What temperatures should I expect?

Typical mixed driving ~185–215°F; spirited/hot weather ~210–240°F depending on airflow and mounting.

Q: Any special maintenance?

Recheck line and fitting tightness after first heat cycles and at each oil change; keep fins clean.

Tomioka Racing TR Temperature Controlled Oil Cooler Kit for 2015+ Subaru WRX

$690.00

~~$690.00~~ $690.00

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Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.

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Keep your FA20 happy on street and track. The Tomioka Racing Temperature-Controlled Oil Cooler Kit is engineered for the 2015–2021 Subaru WRX (FA20DIT) to stabilize oil temps, preserve viscosity under boost, and add confidence on spirited drives, canyon runs, and HPDE days.

Why it works

Thermostatic control (~180°F start-to-open): OEM-like warm-up, then automatic routing through the cooler as temps rise (fully open ~190–195°F).
High-efficiency stacked-plate core: Excellent heat rejection with low pressure drop when paired with the included -AN lines.
Vehicle-specific brackets: Clean, repeatable fitment and reliable airflow to the core.
Motorsport-grade plumbing: Heat- and oil-resistant lines and swivel fittings simplify routing and service.

Real-world benefits

More stable oil temps: Helps prevent heat-soak spikes during back-to-back pulls and long climbs.
Protects bearings & turbo: Keeps viscosity in the sweet spot so the FA20 can take abuse without breaking a sweat.
Daily-drivable: Thermostat bypasses the core when cold—no overcooling in winter.

What’s included

Thermostatic sandwich plate (start-to-open ~180°F)
High-efficiency stacked-plate oil cooler core
Vehicle-specific mounting brackets & hardware
Braided -AN10 oil lines with fittings
Installation guide

Fitment

Subaru WRX 2015–2021 (FA20DIT)
Does not fit STI EJ models.
Compatible with stock or most aftermarket intakes and front bumpers; check airflow path and component clearance.

Installation notes

Estimated time: 2–3 hours with common hand tools.
Prime the lines and check for leaks after the first heat cycle.
Mount where the core gets clean, direct airflow; re-check fittings after initial hard pulls.

Why 180°F instead of 200°F?

Earlier engagement keeps FA20 oil in the ideal operating range during load. A 200°F thermostat simply delays flow to the cooler, often raising steady-state temperatures without adding peak cooling capacity.

Good to know

Idling: Oil temps can rise when parked—any air-to-oil cooler needs vehicle airflow to reject heat.
Track use: For hot climates or extended sessions, prioritize ducting and unobstructed airflow.

Backed by Tomioka Racing. Proven hardware designed for enthusiasts who drive hard and demand reliability.

FAQ

Will this overcool my WRX in winter?

Not with the thermostatic plate. It bypasses the core until ~180°F, so warm-up remains normal and the cooler only engages as needed.

Why not use a 200°F thermostat?

A 200°F plate delays cooling and typically raises steady-state temps. The ~180°F start-to-open strikes the best balance for mixed street/track use.

Do I need tuning after installation?

No tuning is required. This kit manages oil temperature and does not alter ECU calibration.

What temperatures should I expect?

Most cars see roughly 185–215°F in mixed driving and 210–240°F in hot weather or spirited runs, depending on airflow and mounting.

Any special maintenance?

Check line/fitting tightness after the first few heat cycles and at each oil change. Replace lines if damaged and keep the core fins clean.

Application	Subaru WRX 2015–2021 (FA20DIT)
Thermostat	Start-to-open ~180°F, fully open ~190–195°F
Core Type	High-efficiency stacked plate
Lines	Braided -AN10 with swivel fittings
Included	Cooler core, sandwich plate, brackets, lines, hardware
Warranty	Limited manufacturer warranty