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    oil pressure on 1hz - what causes is to drop and what can be done to 'fix' it?

    I've had 3 1HD-T's and talked with a few others that had this motor - no-one sees much pressure in these engines. It's usually just above the low pressure mark when at operating temp. Mileage on all was around 170-220k km. If ppl have other experience I'd like to know.
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