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I've been to about every Valvoline Instant Oil Change in town, many times, over the years. They are pretty strict on how they operate; signals to say when it is okay to do the next step, showing you the dipstick level, etc.
That said, it was ONLY on company cars and NEVER on my own vehicles. In a pinch I'd be willing to use one on a vehicle that is simple to change oil on (my truck), but not my BMW and definitely not my wife's Audi (which is a PITA to change the oil due to stupid engineering).
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