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SD1too · 10th July 2020, 15:17

There are a couple of things puzzling me about this subject.

My SD1 had an oil pressure gauge. Whenever the coolant temperature climbed above 'normal' for any length of time, the oil pressure would visibly decrease. I always put this down to lower viscosity as rrobson has said. Wouldn't this suggest that there is a correlation between water and oil temperatures as Ian asked?

My SD1 didn't have an engine oil cooler but my 75 has. If the 75's coolant temperature rises wouldn't that mean that the heat exchange in the oil cooler would only take place at this higher temperature?

If my reasoning is correct then wouldn't the answer to Ian's question be 'yes'?

Simon

10th July 2020, 15:17	#6
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,380 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	There are a couple of things puzzling me about this subject. My SD1 had an oil pressure gauge. Whenever the coolant temperature climbed above 'normal' for any length of time, the oil pressure would visibly decrease. I always put this down to lower viscosity as rrobson has said. Wouldn't this suggest that there is a correlation between water and oil temperatures as Ian asked? My SD1 didn't have an engine oil cooler but my 75 has. If the 75's coolant temperature rises wouldn't that mean that the heat exchange in the oil cooler would only take place at this higher temperature? If my reasoning is correct then wouldn't the answer to Ian's question be 'yes'? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.