Why is it necessary to change vehicle oil regularly, and not just change the filter and add new oil as needed?
In: Engineering
you wouldn’t eat at a restaurant whose deep fryer policy is changing the oil filter and topping up new oil as needed.
no. a filter can handle burnt bits, but the oil itself is degrading with each heating cycle and also over time just sitting there.
for engine oil policy it is some number of thousand miles driven, recommended by the auto manufacturer, or some time period since the last oil change, recommended by the oil manufacturer, whichever comes first. old oil needs to be drained.
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