1998 Jaguar XJ6 the oil pressure at idle speed drops to near nothing

1998 JAGUAR XJ6
110,000 MILES • 6 CYL • 2WD • AUTOMATIC
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1998 Jaguar XJ6 mileage: 110,000. During hot weather, the oil pressure at idle speed drops to near nothing. During cooler weather, I do not see this fluctuation. Is this an oil cooler thermostat problem?
Nov 9, 2010 at 7:58 PM
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The oil pressure fluctuation is normal for an engine with 110,000. Try using 20/50 motor oil during the summer.
Nov 9, 2010 at 8:00 PM