Check oil level if good check oil it self may have sludge build up-- other problem would be oil pressure sensor or loose connection if good-- possible clogging or damage to oil pump
Sounds like you've got sludge. The best way to deal with it is to change the oil. Flushing with an oil cleaner is dangerouse but faster. The cause of this isrunning too long without an oil change, engine overheating, and antifreeze leaking into the oil. Lots of really short trips where the oil doesn't reach full operating temperture. Change the oil with a good cheap oil including the filter. Run the car for about a week 200 miles and change the oil again, filter and all. do this again untill when you go to change the oil it's not exactly black solid like the first time you changfed it. Another cause of sludging is the car does'nt warm up fast enough and not hitting the full operating temperture, it could need a new themostat. Overheating can cause problems too. Is the cheak engine light on? If it is you need to research the problems and get them repaired because everyuthing effects everything else.
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