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Old 10-18-2018, 04:09 PM   #1
RBBailey
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Default Oil Temp & Pressure

First, over the course of a typical drive, my oil pressure starts off being 45-50 psi at idle, 55-60 psi while driving. As the oil warms up, that psi slowly falls. This understandable, and as the engine ages, I would assume that it would drop more drastically.

Second, once the engine is up to 170-180 degrees (about 10-20 minutes....) the psi will drop to about 30 while driving, 22 while idling. Still not a problem, seems normal.

Finally, once it runs for over 30 minutes, or if the temp ever gets to 180-190 the running psi will be no more than 25, while idle is around 18 psi. This seems low. Again, the engine is probably just old. But I think I can tell the difference in how the engine runs when it gets to this point. It seems more clacky, it seems a bit rougher, etc...

If I allow it to cool down for just 10-15 minutes while I'm in the store or whatever, the water temp stays just about the same, but the oil pressure will come back up to 'healthy' levels.

So here is my question...... would it be worth it to figure out some way to keep the oil a bit cooler? Could a small cooler be installed in line? Assuming that you do want the oil to be at a normal operating temp, could that make it run too cool? Could something as simple as having a sump cover with cooling baffles be a good way to hold off that long term heating, and allow the air flow to better cool the oil?

Again, this is because it seems like there are three 'levels' of oil temp/pressure that occur, and I'd want to keep it in that middle level for as long as possible.
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Old 10-18-2018, 04:47 PM   #2
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Sounds totally normal to me.
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Old 10-18-2018, 06:20 PM   #3
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Normal. The pressure drops as the oil temperature increases. Oil takes a long time to get to temperature. If you have an oil temperature gauge, you will see the pressure drops the hotter it gets. The engine really cares less about the oil pressure. You just need the oil circulating.

If the coolant takes 20 minutes to get to 180, your thermostat is leaking. It should go right to 190 and stay there.
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Old 10-18-2018, 08:38 PM   #4
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I’m just wondering if normal is best. I suppose I would need an oil temp gauge to see exactly what it is getting to, to know if it is at the end of its useful range.

I am not sure what to think of the thermostat. It is new and I inspected it and tested it and the upper hose does stay cool. I may need to buy a few of them and swap out one after another to see if that helps.
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Old 10-18-2018, 09:19 PM   #5
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My opinion. You spend way to much energy worrying about this engine.
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Old 10-18-2018, 11:20 PM   #6
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Nevar!
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Old 10-19-2018, 09:30 AM   #7
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Just curious what engine you are referring to?
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Old 10-19-2018, 09:46 AM   #8
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300Tdi
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