I've got a gallon of 15W-40 oil that has been in its sealed original container for about 4 years at about a cool 65*. I plan on using it in an air-cooled lawnmower, but I'm concerned as to its quality.
Do the components of the oil separate over time where the oil on top is different from that on the bottom ? I wonder if the lighter 15W might rise to the top, and the heavier 40 sinks to the bottom. Since I'll be drawing about 12 oz at a time rather than all at once, as in refilling a car for example, I don't want to harm the engine because the oil is no longer uniform throughout.
Can anybody help me with this ? Thanks in advance.
Do the components of the oil separate over time where the oil on top is different from that on the bottom ? I wonder if the lighter 15W might rise to the top, and the heavier 40 sinks to the bottom. Since I'll be drawing about 12 oz at a time rather than all at once, as in refilling a car for example, I don't want to harm the engine because the oil is no longer uniform throughout.
Can anybody help me with this ? Thanks in advance.