MANUFACTURERS' GUIDANCE
                     INDEX FOR 1981 LETTERS

 DATE          TO:       SUBJECT:                           

 1-23-81       LD        Summary/Assessment of 1981 Model Year
                         Abbreviated Certification Review Program
                         (not legible, not scanned - re-typed)

 3-24-81                 "SF" Multigrade Fuel-Efficient Engine
                         Oils

 4-02-81       LD/HD     Choke Vacuum Breaks--Parameter
                         Adjustment Regulations

 6-04-81       LD        Test Fuel Temperature for Precondi-
                         tioning

 7-01-81                 Relief for Manufacturers--Certification
                         Program Policy Changes

 8-10-81       LD        Fuel Economy Labeling Policy Change

 8-14-81       LD        Test Fuel Temperature for Precondi-
                         tioning

 8-20-81       HD        Heavy-Duty Engine Application Format for
                         1983 Model Year

10-14-81                 Waiving of the PCAFE Deadline for 1982
                         Model Year

10-16-81                 Revised Running Change Request Form

10-26-81                 Questions on Revised Certification
                         Procedure

12-04-81                 Schedule for Second Edition of 1982 Gas
                         Mileage Guide

12-09-81                 Vehicle Change/Addition Implementation
                         Concurrent with Change Submission to 
                         Administrator--Confirmatory Test Ten-Day
                         Notification Period

12-17-81                 Suspension of Telephone Hotline

12-17-81       HD        Test Procedure Change for Heavy-Duty
                         Certification Engines