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Oil Pressure for a B18 120-130

It's hot here in Florida, yesterday 95F (feels like 102F).
On my 1967 Volvo 122S B18 Eng., last oil&filter change used 15W/40 oil

Yesterday, driving along at 60-65mph; air-cond. on
RPM; 2500
Eng.coolant temp. 180-185f
Oil pres. 28 - 30psi
Oil Temp. 210f
But, when coming to a stop at a stop light, oil pressure drops to 0/zero, oil pressure light comes on, unless I raise idle RPM or turn off the A/C.
Is this normal ?
Is my oil pump going bad ?
Would a straight weight heavier oil such a a 50w help ?
Any advise would be appreciated. Thanks






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