0 CHEVROLET o o569 w 1ooo25 fig 1 11 Serial number fag Model Body Assembly Unit Year Style Plant Number 0 0569 W 100023 t Lost number of model year 1960 See Model Identification in this section 3 K Kansas City O Oakland W Willow Run 4 Unit numbering will start at 100 001 at all plants Fig 1 11 shows fag for twenty fifth car built at Willow Run SELECTION OF GASOLINE AND ENGINE OIL Gasoline The Corvair is designed to deliver peak performance on what is designated as Regular Fuel in the continental U S and Canada It must be noted however that Regular gasoline may vary in octane between manufacturers or from one section of the country to another for the same manufacturer If unfavorable performance is encountered because of either or both of these factors dealer adjustment of ignition timing will restore the vehicle to normal operation For operation of vehicle in foreign countries where only fuels of octane ratings lower than U S standards are usually available the customer should be referred to Chevrolet Motor Division General Motors Corporation Technical Service Department Detroit 4 Michigan This department will give detailed information as to the availability of fuels in a given area and any service or adjustment which may be necessary to adapt the vehicle to the fuels available Engine Oil Type of Oil Oils which are used in the Corvair engine must conform to the American Petroleum Institute designations MS or DG These letters refer to service application and DO NOT indicate viscosity Oil Viscosity Oil viscosity is designated by the Society of Auto motive Engineers and is indicated by number i e SAE lOW SAE 20W SAE 30 The higher the number the heavier bodied and slower flowing the oil For winter operation the lighter bodied oils are used to ease starting and to offset the affect of cold weather on oil circulation while the higher operating temperatures of summer require the use of heavier oils The following table will assist in the selection of the proper viscosity oil at various seasons of the year Lowest Recommended SAE Viscosity Oil Anticipated Temp Single Viscosity Multi Viscosity 32 F SAE 30 SAE I OW 30 10 F SAE lOW SAE I OW 30 Below 10 F SAE SW SAE SW 20 Always use SAE 30 if outdoor temperature is above 60 F After the first 1 000 miles of driving if average daytime temperature is below 60 during the break in period the original heavy duty break in oil should be drained from the engine and the crankcase refilled with oil as shown in the accompanying table If average daytime temperature is above 60 F during the break in period change initial break in oil to SAE 30 oil after the first 500 miles of operation Every 4000 miles thereafter under normal operating conditions drain and refill the crankcase in the same manner Adverse driving conditions such as extreme dust conditions or short trip winter driving less than 1 000 miles per month makes it advisable to change oil every month Similar dusty or short trips in the summer make it advisable to change oil every two months Check the oil level on the dipstick frequently The level should be somewhere between the add oil and full marks on the dipstick Do not overfill The oil filter element should be changed after the first 5000 miles of driving and every 4000 miles thereafter more often under adverse driving conditions KEYS AND LOCKS Lock cylinders are furnished for service uncoded this necessitates the coding of all replacement lock cylinders TUMBLERS o c c c SPRING RETAINER Hg 1 12 Side bar lock