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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I would pull the valve cover and see how much sludge is in there. If there is just a slight black film, like mine were, then chances are that detergent oil was used so keep using it. If it is full of thick black crusty sludge then non detergent oil was used so don't start using detergent oil. It is more likely to cause chunks to break loose and clog the oil system than spring a leak.
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