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2026. 6. 30. 작업
Effects of sunlight on engine oil
Engine oil is normally kept inside a light-proof steel box (your engine), so you might not find much information on how it's affected by sunlight. However, other industries use lubricating oil that can be exposed to the sun, and I found this report: Sunlight Degradation of Lubricants UV light is the enemy, and it can affect oil: On a molecular level, the long chain lubricant hydrocarbon reacts with oxygen in the presence of ultraviolet (UV) radiation from the sun. This image shows some oil before and after being exposed to the sun for 5 days: That said, the opaque bottle your oil is in (and even the clear-ish strip on the side) will block most, if not all, of the UV light. If you're really worried, you can buy a 1L bottle of the same oil and compare it with whats in your 5L jug, but I don't think there's going to be an issue. My main worry would be if the jug wasn't properly sealed it would get water or bugs or something in it, but that doesn't sound like the case.
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2003 Hyundai Santa Fe will start then die. Then it will not start. After pumping the accelerator or holding on the floor and returning later it will start. Nothing codes out. This happens probably 15% of the time. Any ideas?
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A friend has an older Miata that was improperly stored for at least three years. Most of the time, it was not garaged. The gas is old, the battery is dead, it has not been started. It was probably parked without an oil change. He is looking to do the minimum to get this sellable, so the primary concern is the initial startup and the brakes. What would be recommended , especially regarding that first engine startup?
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I’ve asked a few mechanics and DIYers this question and so far no consensus. Let’s say you’re 1000 miles away from next SCHEDULED oil change, and you’re about to leave on a 2000 mile road trip. Would you choose to change your oil 1000 miles early before the trip, or 1000 miles late after the trip?