Question about 2003 Chevrolet Suburban 1500

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Should i go to a higher weight oil?

Oil pressure at hot idle is 18-20 highway speed-38-40 any reason for concern at these levels?

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Those seem to be normal levels for operation anything too much above 40 is a concern tho or lower than 15

Posted on May 19, 2009

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Rule of thumb is 10 psi for every 1000 RPM, your numbers are fine.

Posted on Jun 01, 2009

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1 Answer

2002 trailblazer oil pressure drops when stopped returns accelerating


Usually means the engine bearings are worn out, or the oil pump is weak.
As the oil gets hot, it gets thinner, which reduces pressure. When the engine is at idle speed the pump is not pumping as fast as it is at highway speed.

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Oil gauge drops low at idle


Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

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1 Answer

Should I be concerned about the oil pressure light flickering when I brake hard or idle?


Yes, the oil is the life line to the engine, without proper pressure or circulation the engine will die, no different than us humans. The reason why the light goes off is that the engine is running at higher RPM pushing more pressure to the sensor therefore it turn off the light. When the engine running at low RPM the oil pressure is low therefore it not enough pressure to turn off the switch. 1st. it cheap, replace the oil pressure switch and make sure the oil dip stick at proper level. If replacing oil pressure switch does not rectified the issue, the oil pump might be going bad and not pumping proper pressure. Replacing oil pump is a major job. remember, on any vehicle, if it run proper there should be no lights on and that is the reason why they put the lights there for a reason. Check and see you have a small oil leaks.

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MY TEMP GAUGE ON 2005 TDI 130 PASSAT IS RISING NEARER 100oC WHEN CRUISING AT HIGHER SPEEDS, IT COMES BACK DOWN TO 90 WHEN SPEED REDUCED, COOLANT LEVELS FINE AND WATER LEVELS OK, ANY IDEAS PLEASE?


100 degrees is the normal operating temperature for the motor. If it goes higher than that, the thermostate needs to be replaced. The temperature will be higher on the highway because the engine is producing more heat energy due to the higher load on the motor. Diesels idle cooler and the engine will cool down at idle or lower speeds. That is why it is best not to idle your car for long periods of time because this will cause deposits in the engine and glaze the cylinders. The engine is working normal from what you described and there is no reason to worry. I hope this helped.

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1 Answer

Oil pressure drops with reduced rpm,after about 10 min of driving


OIl will get thinner as it warms up and since the oil pump speed is directly affected by the engine RPM's, a drop in pressure after the car reaches operating temp is normal. The question is what are the pressure readings "cold" and "hot" and are they within acceptable specs.

At idle the oil pump is not spinning that fast. When your cruising down the highway, the engine is turning a lot faster and therefore the pump is spinning faster. The faster the pump spins, the more pressure it will make to a point.

Since pressure and flow can be affected by the "weight" of the oil and the operating temperature of the engine, It's hard to make a diagnosis on the internet. You should take it to a repair facility that you trust and have them hook up a mecahnical oil pressure gauge and monitor the pressures cold and hot at idle and crusing RPM's. Then compare the readings with what Jeep says is acceptable.

Low oil pressures can be an indication of among other things worn bearings.

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1 Answer

Yukon 2009 low engine oil pressure in the meter reading To a level slightly over the quarter Engine Oil 10 W. 30 What is the Problem Is it normal I apologize for my Rkkt Thanks in advance


First off I believe you are using the incorrect weight oil. I am pretty sure you should be using 5w20 instead of 10w30. Check your owner's manual to be sure. At idle the oil pressure would be around 1/4 on the gauge and at highway speed it should read about 1/2. Make sure you are using a quality filter such as AC/Delco, Wix, or Purolator. If the oil pressure seems low is this vehicle not under warranty? If so, take it back to the dealer.

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1 Answer

While driving the oil pressure gauge sits between 60 and 65 psi but when i get on the gas it shoots up to 80 psi. When idling it sits on 40 psi.


When the engine is idling, the oil pressure is reduced. At fast idle (such as highway speed) it in increases. This is considered normal. If it goes higher than 80 or lower than 40...have it checked out.

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3 Answers

Oil pressure guage drops after engine warms up


Is it possible that you are using a different brand or weight of oil? 10w30 instead of 10w40 could potentially cause this.


Can also be caused by engine running warmer for some reason.

3 psi shouldn't be much of a concern.

You can try a heavier weight oil if you want it to be a little higher.

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1 Answer

Oil pressure


At idle the oil pressure should be at least 20# at highway speed it should be at least 30# these pressures are on the low end higher is better.

Mar 29, 2009 | 2000 Chevrolet Blazer

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