We Asked Car Mechanics, And These Are 10 Things They Would Never, Ever Do With Their Own Cars
Briefly

My job is to give you an overall state of health of your car, so you can make educated decisions on what to do with it, and to alert you to things that you may not know about, and that you won't recognize or see.
When the engine oil starts to get thick, or it breaks down, when the additives in [the oil] stop doing what they're supposed to do... the engine can break prematurely and deteriorate.
Read at BuzzFeed
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