In one of my non-Mercedes, I have 2 yr old synthetic oil that has been in the car but hardly been used. would it still be good?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

I recently changed to synthetic oil, so this stuff is fresh in my mind. The 2-year-old oil is OK, especially if you have put little mileage on it. The filter, however, should be changed.

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Don't Chrome them; polish them

good. thanks

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

Hmmm, that's kinda interesting.
We routinely change oil based on miles or hours of use; as it becomes contaminated with tiny metal shavings and combustion by-products which break down the oil and add acid, sludge, etc to it.

We know not to store a car for long periods with used old oil, as it has acids and moisture that can attack a stagnant engine.

But, if we are driving a car fairly routinely, but not a whole lot of miles (say 2000 per year) what would be the downside to changing the synthetic oil, say, every 3years or 6k miles?

I drive my Corvette about 4K miles per year, and usually change the oil twice
a year, at about 2k miles. But the car's oil-change computer is telling me I can go 12k miles! So, should I go at least a year on the Mobil 1 before changing it? (not that I probably will on my "baby", just curious).

DG

S-Class_Guru, the term "hardly been used" is assumed to mean that the car is being used, albeit rarely, and not in storage. If it's in storage, I agree w/you on the point of leaving oil in the engine.

Thanks for your imput to my fan switch question. It makes sense.

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Don't Chrome them; polish them