What O-rings should I use on my car?

by Selo Technical Team · Reviewed August 2026 · 2 min read

Quick answer

The correct O-ring material for your car depends on the fluid it comes into contact with, the operating temperature and the component being sealed.

The full explanation

For general chemical compatibility guidance, we have complied the table below to try and assist. 

Which O-ring material suits each automotive fluid?

 Automotive fluid Material to consider
Engine oil NBR or FKM
Petrol / E10 FKM
Diesel NBR or FKM
Coolant / antifreeze EPDM
Glycol-based brake fluid EPDM
Manual gearbox oil NBR or FKM
Automatic transmission fluid NBR or FKM
Differential oil NBR or FKM
Mineral-based power steering fluid NBR or FKM
Screenwash EPDM
AdBlue EPDM

 

Actual suitability depends on the precise rubber compound, temperature, fluid formulation and vehicle manufacturer's specification.

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