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Gauge his remarks by his age as well. If your mechanic is a 55+ year old guy, he is still speaking out of his fossil fuel oil paradigm.
Mechanics are a lot like farmers. Very slow to change and accept new ways of accomplishing the same thing, even if it's faster, cheaper, and more reliable. The old ways are known and trusted because of the test of time.
I'm this way about motor oil myself. I run M1 and still treat it like fossil based oil and change my oil and filter every 5000 miles or 1 year, whichever comes first in all my cars. 2 of the 3 use synthetic oil.
What the other poster said is so true... oil is by far cheaper than a motor, and your mechanic thinks the same thing for a reason. He's replaced motors that didn't need to be replaced if the owner had just changed the oil more frequently.
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