2021 Pete x15 Cummins Back in November 2024 I changed my oil from mobile one extreme full synthetic 15w-40 to a 5w-40 I was running in Va,nc,sc,Ky when it got down in the temperatures 5-8 degrees but all the same brand but had to buy the oil in like three different stores my motor to date has 446,300 all my samples been normal until I done this I only ran like 14,000 with the 5w-40 and came home done a over head, new balancer, and oil change so I just got my reading back and shows the 5w-40 has high oxidation levels for the miles I had on it 14,000 so could it been where I am in Ky that oil sat on the shelves to long or something else
My oxidation levels up in my oil sample
Discussion in 'Ask An Owner Operator' started by Sparechange73, Apr 6, 2025.
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With it being much colder when you changed to the 5W-40 did you idle more? Cold starts during winter weather would also put more unburned fuel into the oil.
Oil when opened is good for about 2 years. When unopened and not exposed to extreme temps (say in a shed exposed to freezing temps or summer heat) it is about 5 years. One thing that can happen is that the additives separate. I recently did a lot of reading on this. One source is Lake Speed aka The Motor Oil Geek who did a you tube video on the shelf life of oil.
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