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1940 230 engine


Erndog

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I think you've rebuilt this engine? If so you can run 30w or 10W30 successfully since straight 20w oil is not easily found. Tractor Supply Co is the only place around here that stocks it, and then only in their Traveller house brand.

Oldsmobile and others recommended use of 20w oil on into the late 1960s for ambient temperatures above freezing, or alternately 10W30.

The Chevy dealer in South Boston used 20w in all their service work, and if a car came in for excessive oil consumption, the first thing they did was change oil and filter using Sinclair 20w oil. If oil consumption hadn't decreased dramatically after two oil changes, then they would tear into the engine.

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