96R Posted February 25, 2017 Report Posted February 25, 2017 Had a hard time finding the cause of loud engine tapping sound for several months. Initially I thought it was a leaking o-ring in the motor oil sump. I know ticking, loud lifters and injectors are common Volvo 960 S90 problems. Finally, Robert at www.RobertSpinner.com suggested that I make sure it's running 10w-30 oil, use MANN oil filter, run 92+octane gas. Thanks Robert! I did did all that Robert recommended, plus serviced the PCV and changed a few aging vacuum lines. Now the engine is purring silently like new at 123,000 miles.
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