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Old Nov 25, 2020 | 01:22 PM
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Will a little heavier oil raise oil pressure. On hot day mine runs around 35 highway speed and 20 at idle. 2000 with 90000 miles

Last edited by namvet6869; Nov 25, 2020 at 01:24 PM.
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Old Nov 25, 2020 | 01:26 PM
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Those pressures are within spec. Heavier oil will raise pressure to a degree, but that doesn't fix any underlying problems you may or may not have.
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Old Nov 25, 2020 | 01:33 PM
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I use mobile 1 10-30, why? I don’t know. I guess it’s just a preference. Thinner weights just seem like water to me. Cars are getting 300,000 miles on thin oil. I use 5-20 in my fusion sport and it’s fine.
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Old Nov 25, 2020 | 01:51 PM
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I've never had any issues running Mobil 1 5w-30. As long as you're within spec, why would you change?
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Old Nov 25, 2020 | 08:35 PM
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I'm running 10-30 Mobil One on this fill. Pressure may have gone up one or two psi at idle once up to full temp.
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Old Nov 26, 2020 | 11:58 AM
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5/30 mobil 1 in the vette and 0/20 in the 15 silverado now that oil really is like water !!! I really don't know why GM put that oil in the truck.
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Old Nov 26, 2020 | 12:00 PM
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Originally Posted by choyt
5/30 mobil 1 in the vette and 0/20 in the 15 silverado now that oil really is like water !!! I really don't know why GM put that oil in the truck.
CAFE standards and fuel economy. It's what the gen5 engines are designed to run on. It'll be fine.
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