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I have always thought that changing the oil before storage just to change it again when you bring it out again to be a waste of time and money. When you store the car, your primary concern regarding oil is to have as little moisture in it as possible. This is accomplished by running the engine at full temperature for some time and then shutting it down in as dry an environment you can find. Personally, I add a full quart of a straight mineral oil to the crankcase (40 or 50 weight), run the engine to full temperature and just store it with whatever oil is in the engine and change it in the spring.

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Change your oil and filter before storing. You want to remove any corrosive acids that may have formed as a by-product of the combustion process and been picked up in the motor oil. Best way is to drain, replace the filter, and fill with fresh oil. Running the engine up to operating temperature will boil off any moisture.

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Actually acids are formed as a by product of oxidation. Oxidation happens when oil heats up. Oil manufacturers use magnesium or boron as an additive to neuatralize acid. Oxidation also causes sludge.

Acid is also formed by the normal combustion process which is in the form of blow by.

By products of combuston are deposited on the cylinder wall portions that are exposed to the combustion flame front above the top of the

piston and then carried into other components by the oil.

Rust and corrosion are results of water in the oil. All engines if not run up to temp will have water absored causing corrosion of which is countered by anti rust and corrosive additives in the oil. These additives do deplete over time and are considerd sacrificial.

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Actually acids are formed as a by product of oxidation. Oxidation happens when oil heats up. Oil manufacturers use magnesium or boron as an additive to neuatralize acid. Oxidation also causes sludge.

Acid is also formed by the normal combustion process which is in the form of blow by.

By products of combuston are deposited on the cylinder wall portions that are exposed to the combustion flame front above the top of the

piston and then carried into other components by the oil.

Rust and corrosion are results of water in the oil. All engines if not run up to temp will have water absored causing corrosion of which is countered by anti rust and corrosive additives in the oil. These additives do deplete over time and are considerd sacrificial.

There is no bad acid produced without water or depletion of acid neutralizers in the oil.. A fully warm engine will evaporate the moisture produced by combustion that may get to the crankcase via blow by.

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