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2007 ZJ---BLACK OIL !!!!!
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=67&t=90876
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Author:  Derlbu [ Thu Jan 16, 2020 4:37 pm ]
Post subject:  2007 ZJ---BLACK OIL !!!!!

This question may have been beaten to death, but I need some info please.
I just had my oil changed on the Cummins turbo diesel 6.7 litre. I used the Valvoline premium blue that Cummins recommends, to my surprise after the tech installed the oil and having me start the engine and shut it down, he check the dip stick and the oil on the dip stick way already BLACK !! without driving 1 mile on the truck. The tech was even surprised the oil on the dip stick was black, he checked it like 3 times and each time it was black on the dip stick, is this normal ?? Thanks

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