2021 HONDA RIDGELINE fuel additives

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Page 484 of 597

HONDA RIDGELINE 2021  Owners Manual (in English) 483
Driving
Refueling
Fuel Information
■Fuel recommendation
Use of a lower octane gasoline can cause a  persistent, heavy metallic knocking noise 
that can lead to engine damage.
■Top tier deterge

Page 505 of 597

HONDA RIDGELINE 2021  Owners Manual (in English) 504
uuMaintenance Under the Hood uEngine Coolant
Maintenance
Engine Coolant
This coolant is premixed with 50% antifreeze and 50% water. Do not add any 
straight antifreeze or water.
We recommend you c