Acura NSX 1991 Manual page 68

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According to state and federal regulations, failure to perform maintenance on the items marked with an asterisk (*) will not void customer's emission
warranties. However, Acura recommends that all maintenance services be performed at the recommended time or mileage period to ensure long-term reliability.
Severe Driving Conditions:
Driving less than 5 miles (8 km) per trip or, in freezing temperatures, driving less than 10 miles (16 km) per trip.
Driving in extremely hot [over 90°F (32°C)] conditions.
Extensive idling or long periods of stop-and-go driving.
Trailer towing, driving with a car-top carrier, or driving in mountainous conditions.
Driving on muddy, dusty, or de-iced roads.
NOTE: If the car is driven OCCASIONALLY under a "severe" condition, you should follow the Normal Conditions Maintenance Schedule on pages
SECTION
and
PAGE
17-59 ('91-'93),
or ('94-'96)
16-3
19-26
10-6, 12-5
13-3, 14-105
('91-'93), or ('94-'96),
19-69
('91-'92),or ('93-'96)
10-2
9-5
11-130 ('91-'92)
('93), or ('94-'96)
4-4 and 4-5.