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    Low oil pressure & dropping with higher rpms on Lehman 120 hp twins (?)

    I'm a prospective buyer of a GB with twin 120 hp Ford Lehman 2714E diesels, 1974 vintage, about 3,000 hours. Baffled by the mechanics' oil pressure readings and eager for insights. New 30-wt oil in both engines (replaced 10-40). In neutral, at idle, cold start to 1500 rpms shows 25 psi. Revving...
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