Quote:
Originally Posted by hurryinhoosier62
Combustion byproducts in oil have a nasty tendency to turn acidic in the presence of moisture. I’ve seen it in aircraft recip engines and classic automotive engines as well. Changing the oil is cheap insurance to prevent acid damage of internal engine components.
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Yes im aware of combustion byproducts and acids etc... there are additives in all oils that neutralize them, with lower miles as mentioned, the additives do what they are supposed to do... theres no difference from sitting for a short time with lower miles than driving the car to reach the maximum miles before an oil change, if anything taxed oil at the end of its life has more acids in it and is exposed to more moisture from starting & driving. Clean low mile oil is perfectly safe to sit for a few months during storage or a full year. Valvoline confirmed this when I asked.
Quote:
Originally Posted by Formulajones
That's why I mentioned the oils formulated to those specific situations of sitting for long periods. That meant in the engine and have been run to some extent. As you said they get vary acidic and cause corrosion etc...
The article quoted above is referring to oil sitting in its original container. Completely different scenario.
Just making sure people are aware of the distinction so there is no confusion
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The valvoline article/FAQ was quoted in regards to new oil in the bottle, as I mentioned I have/use older but new oils all the time without issue, and there are lots of people out there with stashes of older oils older than 5-8-10 years.
Some people seem to think new oil goes bad sitting in the bottle for a few years so I quoted the info. Some also think clean oil with lower miles in the engine for ~1 year goes bad and needs to have a special additive package... but then again some think they need VR1 racing oil in their stock cam engine, none of that is true or based on any scientific proof. Valvoline as well as many mechanics I know have said low mile clean oil is perfectly fine to use after 1 year, and based on my experience of doing that for 25+ years theres is nothing to indicate otherwise.