Why is it necessary to change vehicle oil regularly, and not just change the filter and add new oil as needed?
In: Engineering
Only engine oil needs frequent change. Mostly because of fuel contamination, moisture (water) and extreme pressure and extreme heat. Oil in sealed gearbox can be left there for almost a lifetime without major failure. Though not recommended.
In an engine sludge will make it fail eventually if not changed regularly. The filter is only there for physical contaminents.
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