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Water via condensation is the biggest concern. Does the oil cap have a milkshake look to it? Water inside the engine tends to do bad things, and is never a good thing. At the very least, go drive it on a one hour trip this summer and get the engine fully heated and heat soaked.
For the price of an oil change, personally I would change it, but it is just the Toyota, and it ain't my car.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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