Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Honda Ridgeline RTL, FWDFACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Compressor Oil | 4.50 OZS. | 0.13 L | RL85HMS (POE) | Approximate capacity. | S | ||
| Air Cond Refrigerant | 1.35 LBS. | 0.61 KG | HFO-1234yf (R-1234yf) | Approximate capacity. | S | ||
| Automatic Transmission Fluid | Drain and Refill | 3.70 QTS. | 3.5 L | HONDA Automatic Transmission Fluid ATF - Type 3.1 or higher | S | ||
| Brake Fluid | N/A | N/A | HONDA Heavy Duty Brake Fluid DOT 3 | Fill to line on reservoir. | S | ||
| Differential Gear Oil | Rear | 1.92 QTS. | 1.81 L | HONDA DPSF-II | S | ||
| Engine Coolant | 1.96 GALS. | 7.41 L | HONDA Long-Life Antifreeze/Coolant Type 2 | This coolant is pre-mixed with 50/50 antifreeze and water. Never add straight antifreeze or plain water. If Honda antifreeze/coolant is not available, you may use another major-brand non-silicate coolant as a temporary replacement. Make sure it is a high-quality coolant recommended for aluminum engines. | S | ||
| Engine Oil | Drain and Refill,w/Filter | 5.70 QTS. | 5.39 L | Genuine HONDA Motor Oil 0W-20 or API premium grade - SAE 0W-20 Detergent Oil | You may use a synthetic motor oil if it displays the API Certification Seal, and it is the proper weight. | S | |
| Engine Oil | Drain and Refill,w/o Filter | 5.40 QTS. | 5.11 L | Genuine HONDA Motor Oil 0W-20 or API premium grade - SAE 0W-20 Detergent Oil | You may use a synthetic motor oil if it displays the API Certification Seal, and it is the proper weight. | S | |
| Fuel Tank | 19.50 GALS. | 73.81 L | S | ||||
| Transfer Case Fluid | Drain and Refill | 0.45 QTS. | 0.42 L | HONDA HGO-1 | S | ||
| Windshield Washer Fluid | 4.02 QTS. | 3.8 L | All Weather Windshield Washer Fluid | Follow the Manufacturer's Instructions for the mixture ratio. | S | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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