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A comment on Global Shortage Has Led to Motor Oil Rationing at Costco. Parent comment

Re:Global Shortage Has Led to Motor Oil Rationing at Costco by 6yyyyyy on Sunday September 13, 2026 @04:22PM (#49688282)
The seal between the piston and the cylinder isn't perfect, so when the engine runs combustion products will mix with the oil, making the oil eventually unusable. That's why ICE engines meed oil changes so often.
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Re:Global Shortage Has Led to Motor Oil Rationing at Costco by loeg on Sunday September 13, 2026 @06:35PM (#49689439)
And in fact it is necessary for it to be imperfect, and the oil is what lubricates the interface. So it is necessarily exposed to lots of heat and pressure.
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