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Originally Posted by DINO55
Sludge does not turn into clumps and scatter through an engine, Over time, and extreme heat, it builds up on almost everything inside your engine. Some Oil's will keep it cleaner better then others, but ALL oils will leave deposit's behind
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The reason why I ask is, because I have a 350 that had not been taken care of well by the previous owner. It is a fact that oil changes weren't done reguarly. When I removed the intake manifold for a intake gasket change, there was oil sludge clumps all over the block and around the pushrods. This engine also has lower than normal oil pressure.
This is not the first time that I've seen "clumps" inside an engine (that weren't my own engine), with questionable service history.
I didn't mean that the "clumps" would scatter throughout the engine as in it is pushed in circulation, I meant as in formed throughout the engine, due to lack of oil changes, etc.
However, I have 2 (actually 3 now that I think about it) engines that are almost at 200K miles, and they have no oil sludge or clumps, and the engines had been properly maintained.
That's why I didn't think oil sludge is normal, unless there is lack of oil changes, or perhaps driving habits that contribute to it.
But my other point is, how will you ever get that stuff out of the engine, that can be inside the oil pump screen, galleries, etc.? I don't see how you can.