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Ok I know I have seen a lot of discussion on this topic but need to ask as well. Disco Mike seems to be a wealth of information. I just recently bought a 2000 Disco 2 that has a complete valve job done about 20K miles ago. I needed to replace the oil pump since pressure was lower than recommended but did not trigger the oil light. I pulled the pan and the pick up tube, bottom of oil pan sump were covered with sludge. I pulled the front cover examined the oil pump and found that the pump gears were scoured as well as the cover it rides in. Question -- would it make sense to pull a couple of bearing caps to examine the rod and main bearings? I have seen several pros and cons about bearing crush, et al. What is the authoritative response on this somewhat controversial issue?
 

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I wouldn't pull any bearing caps until you see what the pressure is like with the oil pickup/base pan cleaned and the new pump is installed.

If your engine is not really noisy and the oil light does not come on I would just run it. These engines can run fine for a long time on like 4-5 psi at hot idle. I didn't believe it when this was told to me first but it has proved to be true.

Been down this road................
 

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+1 to what Optimus said - unless you are certain you hear bearing knock, leave well enough alone. If your oil light never tripped odds are that you don't have any bearing damage.

If your engine is as sludged up as you say, I'd recommend filling it up with an "economy" oil/filter combo and then throwing in a can of Seafoam into the crankcase and running it like that for 100 or so miles to let the solvents in the SF eat away at some of the deposits. Then drain and refill with quality fluid and a good filter. Don't run it for too long - the detergents in the Seafoam are pretty harsh on engine internals.

If possible, use synthetic oil (Mobil 1, Rotella T6) and a good filter (Mobil 1, Bosch) and decrease your oil change interval to 2500 miles for the next 3-4 changes. Fresh oil will help dissolve the sludge and the good filter will keep chunks from reentering the system.

And to top it all off, install an oil gauge that lets you keep an eye on pressures on-the-go.
 
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