The Plug-In Hybrid version of the 2018 Honda Clarity uses about 3.7 quarts of engine oil with a filter; the Fuel Cell and Electric variants do not require engine oil. This article breaks down the oil requirements across the 2018 Clarity lineup and offers practical maintenance guidance.
Honda’s 2018 Clarity lineup included three distinct powertrains: the Plug-In Hybrid (PHEV), the Fuel Cell (FCV), and the all-electric (Clarity Electric). Only the plug-in hybrid has a conventional internal combustion engine that needs lubrication, while the FCV and Electric models rely on electric drivetrains with no engine oil requirement. Here is what owners should know about oil capacity and maintenance for each variant.
Oil capacity by Clarity variant
The following figures reflect typical engine oil capacity for the 2018 Clarity variants, including the oil filter. They are intended as a general guide and may vary slightly by vehicle or market.
- Plug-In Hybrid: 3.7 quarts (3.5 liters) of engine oil with filter
- Fuel Cell: Not applicable — no internal combustion engine requiring engine oil
- Electric: Not applicable — no internal combustion engine
Regardless of variant, always verify the exact specification in the owner's manual or with a Honda dealer for your VIN, as regional differences or production changes can occur.
Maintenance guidance for the 2018 Clarity
For the Plug-In Hybrid’s gasoline engine, follow Honda’s recommended oil-change interval, which depends on driving conditions and climate. Typical intervals are around every 5,000 to 10,000 miles, or at annual service, with the correct grade specified in the manual (often 0W-20 synthetic in many markets). Use a Honda-approved oil filter to maintain engine health.
Practical tips for owners
Set reminders for oil changes, keep service receipts, and ensure you select the right oil grade for your climate. If you mostly drive in electric mode, don’t skip periodic checks of the gasoline engine’s oil level and oil-change schedule for the PHEV version.
Conclusion
For the 2018 Honda Clarity Plug-In Hybrid, plan on about 3.7 quarts of engine oil with filter. The Fuel Cell and Electric variants do not require engine oil. Always confirm current specifications in your manual or with a Honda service representative, since regional differences can apply.
Summary: The Plugit‑Hybrid Clarity requires about 3.7 quarts of engine oil with filter; FCV and Electric variants do not use engine oil.