Changed oil and filter.
Sounds like your pcv valve is clogged causing the oil to back up.Here's a link on how to replace. Repair Guides Routine Maintenance And Tune up Positive Crankcase... Here's the part,and it's easy to do. AZ Filters PCV Valve PCV1142DL 1990 Nissan Datsun Pulsar 4 Cylinders 1...
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