Mobil 1 5w-30 HM Ep @ 9.9k mi / GM 6.0L vortec @ 160k
- Thread starter 2Strokin
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yes, go for an A3/B4 certified oil like M1 0W-40
Heavy towing is severe use. 10,000 miles may be too much for the oil but t he oil held up well look at the flash point and viscosity
That's actually a very good UOA. I understand iron is higher than you'd like, but thats a great number for nearly 10K miles. You could choose Mobil 1, 5W-40 Turbo Diesel Truck for a more robust oil. The 0W oils will probably shear faster and you may not see an improvement.
We've seen iron numbers in the 250 range and very low detectable wear on race engines. UOA results and metals do not really indicate wear rates. Conversely, we've seen destroyed components and good UOA results. People really associate UOA Fe numbers result and cylinder wear. That's simply not the case. Pushrod engines have plenty of small components that each generate tiny amounts of detectable iron.
We've seen iron numbers in the 250 range and very low detectable wear on race engines. UOA results and metals do not really indicate wear rates. Conversely, we've seen destroyed components and good UOA results. People really associate UOA Fe numbers result and cylinder wear. That's simply not the case. Pushrod engines have plenty of small components that each generate tiny amounts of detectable iron.
And a UOA is far more about the specific engine and operating conditions then it is about the oil.
D
Deleted member 89374
Mobil 1 isn't that great of a motor oil it seems. I no longer use Mobil 1 in any of our vehicles. Is it bad oil? No, but probably on par with SuperTech and Amazon Basics, which isn't high praise for a brand that at one point in time was the leader in synthetic motor oils. The higher Iron says that you need a more robust motor oil. Try Quaker State Euro 5W-40 API SP. It's awesome motor oil!
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If you can even find it anymoreMobil 1 isn't that great of a motor oil it seems. I no longer use Mobil 1 in any of our vehicles. Is it bad oil? No, but probably on par with SuperTech and Amazon Basics, which isn't high praise for a brand that at one point in time was the leader in synthetic motor oils. The higher Iron says that you need a more robust motor oil. Try Quaker State Euro 5W-40 API SP. It's awesome motor oil!
760 ppm Mg is impressive, just 10.0 cSt at 100°C isn't, even for a 5W-30 and after 10,000 mls. HTHS is likely considerably
below 3.0 now.
I'd look for HTHS above 3.5 or even close to 4.0 and 300 - 400 ppm of Boron. Change oil between 5,000 and 7,500 mls.
below 3.0 now.
I'd look for HTHS above 3.5 or even close to 4.0 and 300 - 400 ppm of Boron. Change oil between 5,000 and 7,500 mls.
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4WD
$50 site donor 2023
What a loadMobil 1 isn't that great of a motor oil it seems. I no longer use Mobil 1 in any of our vehicles. Is it bad oil? No, but probably on par with SuperTech and Amazon Basics, which isn't high praise for a brand that at one point in time was the leader in synthetic motor oils. The higher Iron says that you need a more robust motor oil. Try Quaker State Euro 5W-40 API SP. It's awesome motor oil!
High mileage engine, heavy use and long OCI. Do shorter OCI's.
4WD
$50 site donor 2023
I’m wondering what was out of spec with this oil … ?
Many suggested an XW40 … seems like that’s worth a try considering many miles or hard work …
Castrol wouldn’t of had this problem it’s time to switch.
4WD
$50 site donor 2023
Why is that ?
4WD
$50 site donor 2023
Yeah … the oil is in spec … just might need a higher HTHS than a 5W30 brings for that motor/service level …
D
Deleted member 89374
I absolutely agree and definitively approve
Mobil 1 makes okay oil, not great oil. At one point they made the SuperTech for Walmart that was sold in the western parts of the US. Exxon is a whole seller, they don't give two craps about spending money on R&D. I hope I didn't hurt anyone's feelings, however, Mobil 1 is average motor oil at best.
4WD
$50 site donor 2023
You should not post (with great authority) when you know nothing about EMRE or this product line.I absolutely agree and definitively approve
Mobil 1 makes okay oil, not great oil. At one point they made the SuperTech for Walmart that was sold in the western parts of the US. Exxon is a whole seller, they don't give two craps about spending money on R&D. I hope I didn't hurt anyone's feelings, however, Mobil 1 is average motor oil at best.
Your comments to date prove you don’t …
I switched to 5w40 at just under 200,000 miles on my 6.0. Your iron is so significant it might interesting to see how it is with 5w40. Try to duplicate the 10,000 miles and see. Report back. We’d be interested. 
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