Acura NSX 1991 Manual page 66

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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.
For Canadian models:
This Maintenance Schedule outlines the minimum required maintenance that you should perform to ensure the trouble-free operation of Canadian model.
Due to regional and climatic differences, some additional servicing may be required.
SECTION
and
PAGE
19-26
10-6, 12-5
13-3, 14-105
('91-'93), or
('94-'96),19-69('91-'92)
or ('93-'96)
17-59
16-3
10-2
9-5
11-130 ('91-'92),
('93), or ('94-'96)