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Ask Mobil Archive -
High-Mileage Engines
DateQuestionAnswer
06/15/2009
Keeping Oil Pressure Up in a Chevy Truck
My daughter has a '98 Chevy 4x4 truck with 127,000 miles on it. After the oil gets hot, the oil pressure drops to around 20 lbs. She runs 5W-30. Short of rebuilding the engine, would it help to run hi...
It is not unusual for a higher mileage vehicle to run at lower oil pressure and this alone should not be of any concern. This is primarily due to larger clearances due to normal wear and tear. We reco...
04/27/2009
Is Mobil 1 15W-50 Okay to Use in a Ford F-150?
I purchased a 1992 F-150 with a 4.9 I-6. The vehicle has 143,000 miles on it and runs well. The service history shows oil changes that include the use of 10W-30, 5W-30, 10W-40 and 20W-50 but never syn...
In hot climates like south Texas, Mobil 1 15W-50 would be a great choice as it will provide the durability you are looking for. Mobil 1 is an excellent choice for high mileage vehicles. If you want to...
12/30/2008
Oil for a Pontiac Grand Am GT1
I have a 2001 Pontiac Grand Am GT1. It's one of 525 that came from the factory with the 75th Anniversary Edition package installed on it. Love the car. But I have had a problem that it seems like a lo...
We recommend you use Mobil 1 10W-30 or Mobil 1 5W-30. Both meet GM4718M, which is the highest lubricant performance specification for GM vehicles.  It is absolutely safe to run a synthetic oil in an o...
09/09/2008
Any Reason to Switch Off a Semi-Synthetic Motor Oil in a Higher Mileage Truck?
I have a 2004 Ford E-150 with a 4.6 and 205,000 miles on it. I have changed my oil and filter every 4,000 miles with the same 5W-20 semi-synthetic oil. Should I stay with a semi-synthetic or would I b...
You can stay with the semi-synthetic and use Mobil Clean 7500 which provides guaranteed protection for 7,500 miles or six months, whichever comes first.  Obviously, a full synthetic like Mobil 1 High ...
06/28/2008
Is it Okay to Use a Higher Viscosity Oil Than What's Recommended for a Vehicle?
I recently changed my oil to 15W-50 Mobil 1 Extended Performance. I have an old 1990 Toyota 4 Runner with 275,000 miles, rebuilt 75,000 miles ago. I discovered this web site after changing the oil mys...
Either Mobil 1 viscosity grade will provide outstanding protection and performance. For an older vehicle there is a occasional benefit sometimes in using higher viscosity grade oil especially if you a...
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