Acura NSX 1991 Manual page 975

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R-Replace I—Inspect After inspection, clean, adjust, repair or replace if necessary.
Check oil and coolant level at each fuel stop.
Under severe driving conditions, service these items more often.
For cars sold in California, this service is recommended only: other areas, it is required.
Replace every 6 years or 60,000 miles (96,000 km), whichever comes first.
Thereafter, replace every 2 years or 30,000 miles (48,000 km), whichever comes first.
This service is recommended only.
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