A 200,000+ truck? I would suggest a 15w40 blend diesel oil and forget about the high priced Europe spec oils.
Mobil 1 European Car Formula 5W50 in a Silverado
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HAHA, I actually tried that in a car years ago. Wouldn't turn over fast enough to start below 60F.
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No sir. Only real Kendall will do. Something like this.
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I think it needs some Lucas
Just taking small steps from 5W30 to 10W40 and now 5W50. After this, might try 10W60.Personally, I'd run some good 20w50 and see if the pressure comes up.
Agree. He should try DELO 400 XLE SAE 15W-40.
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Well, unless the bearings are worn, it doesn't "need" any heavier oil. It may however, if it has the issue I mentioned, need an oil pump. Chasing pressure for the sake of pressure in an engine that didn't require anything heavier than an xW-30 when it was built is just wasting power and fuel (albeit, not a whole heck of a lot).
Maybe 15w50 M1 or any decent 15w40 for starters.
I have a 2008 6.0 with almost the same mileage. Using a viscosity of 12.7 cSt gives me a cruising oil pressure of 40 psi. The change from a viscosity of 9.3 cSt was only worth a few psi as you already observed. It’s possible your O ring on your oil pickup tube needs replacement. There is a lot written on it in the forums. Not a bad job on a two wheel drive, but more work on a four wheel drive as the front diff needs to be dropped to get the oil pan off.Just want to experiment on my 2007 Silverado 6.0L 210,000 mile truck. Used 10W40 the last oil change 2 years ago after coming off 5W30. With 5W30 at 1700 rpm cruising oil gauge was at 30 psi and downshifting to 2700 was not much better. Hot idle was 20 psi. which is fine.
Using 10W40, the first two numbers went up maybe 3 psi, idle the same. Time for an oil change and thinking of trying a 5W50 this time just for curiosity. This is on sale: https://www.napaonline.com/en/p/MOR...EggPFBu_wr82zFFBZki0DzMLtKl8SraRiR4Xvf3OR_qMw Any guesses what it might do?
This one is 13.3 cSt at 100 C. 5w30 vs 5w40 is not enough info. You need the kinematic viscosity at 100 C to make any logical decisions. 
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How accurate are these dash OP gauges? The one on my 2016 6.0L shows 40 psi whether the oil is cold or hot, so that's obviously a joke.
Water temp gauge also has a large disparity between what it shows and what the OBD reads. Come to think of it, I think the only accurate gauge in my truck is the tachometer, and even that is within a rough tolerance.
Water temp gauge also has a large disparity between what it shows and what the OBD reads. Come to think of it, I think the only accurate gauge in my truck is the tachometer, and even that is within a rough tolerance.
Isn't the first number for cold starts and second one when fully warmed up? If so, why would 15W40 be any better than 10W40?
Most 10W-40 oils are closer to a 30 grade in KV and HTHS. I haven't seen a "new" 10W-40 in I don't know how long. It's a dead grade.
Most 15W-40 oils have a much higher KV and HTHS.
From what I can find most of the 10W40 oils out there have a KV100 similar to most 15w40, and have an HTHS around 4 that's much closer to 15w40 than 5w30.
Or the famous Shell T-6? It has a rebate right now even....
You're going to love me. I put RGT in a car once, and a Motorcraft oil filter on a Chevrolet. The humanity!
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