1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Heavier oil viscosity may bring up the pressure enough to keep the light out, but if you do have a low oil pressure problem with the recommended oil you may want to find out why. A mechanical oil pressure gauge can attach to where the sender screws into.
Carbon build up between the throttle bore and blade can restrict air at idle and is certainly a recommended maintenance. Use carb cleaner/solvent, a toothbrush and a rag to clean the area and retry the idle quality.
Use an OEM PCV valve only. May sure that the rubber PCV breather hoses are still firm and not rotted or sucked flat while idling. Make sure that all vacuum hoses are connected at both ends under the hood.
Carbon build up between the throttle bore and blade can restrict air at idle and is certainly a recommended maintenance. Use carb cleaner/solvent, a toothbrush and a rag to clean the area and retry the idle quality.
Use an OEM PCV valve only. May sure that the rubber PCV breather hoses are still firm and not rotted or sucked flat while idling. Make sure that all vacuum hoses are connected at both ends under the hood.