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I have heard of commercial oil change places doing it that way. For the average commuter soccer mom vehicle it is a time saver.
I personally would never do it on my old high mileage cars. I have magnetic oil drain bolts and I like to inspect them, and there is always a grey almost metallic goo on them. Never any chunks, just the pencil lead like coating.
I have done will over 100 oil changes on the trusty El Camino, and lots on the 911. It is pretty easy.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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