Lets assume we use 10w-40 in the new car, and change it after 4~5K and engine will be good.
Whereas same engine oil, in same car BUT 15~20 YEARS OLD MODEL, will run only 2.5~3K and we have to change it. Because older engines start making more slug and beat the engine oils more than newer engines.
True or False?
Any experience or observations?
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