Can engine oil older than 5 years be used?

[JasmineDella]

Can engine oil older than 5 years be used? The functions of engine oil are: lubrication, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion prevention, shock absorption, and anti-wear. The method for changing engine oil is: 1. Lift the car, remove the protective plate, and place a container of about 10 liters under the oil drain plug; 2. Unscrew the oil drain plug, use an air gun to blow for two minutes at the oil filler port, tighten the oil drain plug after draining, and wipe with a tissue to check for leaks; 3. Reinstall the protective plate and lower the car, then use a funnel to add oil through the filler port. Types of engine oil: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Full synthetic oil.

[DiRafael]

I really don't think engine oil older than 5 years is suitable for use anymore. Engine oil deteriorates over time, especially if not stored in a particularly dry place—it can absorb moisture from the air or start oxidizing. This leads to a significant drop in lubrication performance, and the additives become ineffective. I've seen many car owners experience increased engine noise, higher fuel consumption, and even internal wear after using old oil. Engine oil typically has a lifespan of just 2-3 years; after more than 5 years of storage, the oil quality may become as thin as porridge, failing to protect engine components. New oil isn't expensive—a barrel costs just around a hundred bucks—so don't risk it to save a little money. I recommend buying fresh oil to replace it or going to a professional shop to have the oil condition checked by experts. This is about driving safety and the car's lifespan—it's worth spending a bit more on maintenance.

[DiCarmen]

It's best to avoid using engine oil that's over 5 years old. Oil deteriorates over time, even if it looks fine in the bottle. It may absorb moisture, oxidize, and form sludge or sediment, compromising lubrication. I've had firsthand experience: once used long-stored oil, and the car shook badly at low-speed starts. Inspection revealed degraded oil quality. The mechanic warned such issues plant hidden dangers in engines. Fresh oil is affordable and reliable—why gamble your engine over small savings? Storage conditions matter; damp basements accelerate deterioration. Engine oil typically has a shelf life of just a few years—don't attempt shaking expired oil or mixing it with new oil. Cars are daily tools; maintenance seems minor, but repair costs are high and risks unjustifiable. Regularly check oil label dates to ensure safe driving.

[TaliaDella]

Don't use engine oil older than 5 years. It degrades over time in storage, losing lubricating properties. Fresh oil is worry-free and affordable, while aged oil may cause engine issues leading to costly repairs. Check barrel seals but don't take risks. Replace with new oil to ensure safety.