Going by his theory that his low pressure is due to the worn pump, if he gets a pressure boost downstream of the pump then there's more oil flowing out of the pump.
The question is whether that boost in pressure overcomes the higher friction in the rest of the engine due to the heavier oil for a net increase in flow to the bearings, etc. Maybe, maybe not.
One way to look at it would be is 20-50 ok for a new 401 with presumably nominal clearances?
If not then he shouldn't use it since even if the pressure is higher than with the oil he started with it won't be as high as it would be with a good pump and the flow isn't enough with that good pump.
The question is whether that boost in pressure overcomes the higher friction in the rest of the engine due to the heavier oil for a net increase in flow to the bearings, etc. Maybe, maybe not.
One way to look at it would be is 20-50 ok for a new 401 with presumably nominal clearances?
If not then he shouldn't use it since even if the pressure is higher than with the oil he started with it won't be as high as it would be with a good pump and the flow isn't enough with that good pump.
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