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Hello. This is my first post. I have a '97 Wrangler tj 4 banger with 100,000 miles. Doesn't use oil and has good oil pressure. Several days ago I had my oil and filter changed and the mechanic put in 20W50. I had been running 10W30. Now I hear a slight clicking or tapping noise when I crank up...

When I bought my '97 Wrangler TJ,2.5 4 banger, it had 92,000 miles. Oil was black, but no sludge. I changed the oil and filter and checked the oil after about 200 miles and it was black. I changed the oil and filter after 2,500 miles, check it at about 150 miles and again the oil was black...