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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!
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| | | | Joined: Mar 2005 Posts: 86 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 86 | Hi All,
I recently put a good used 292 out of a 66 c60 in my 66 c20. It ran great! When I changed the oil I added a half quart of Marvel Mystery Oil to help clear out the old sludge and give the lifters a good cleaning out.
On my first highway trip I was about an hour outside of town keeping a watchful eye on the oil pressure when the gauge went to zero. I shut it down and pulled over to find that the oil pan looked like it had black spaghetti coming out of it! The sludge apparently cleared itself out exposing small corrosion pits and thus relieving the motor of its oil.
I had the truck towed home ($$$) and plugged the holes and added oil to find a LOT of noise coming from the motor that only got worse. I ended up putting my spare 78 c20 292 in it (the oil pan looks great!) and it is running fine again.
Lesson learned: Inspect your oil pan very closely on used motors!!!
JC in KC
"The future will be better tomorrow." Dan Quayle
1965 Chevy C10 Long Fleetside
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