Hello. I'm new to the forum, although I've visited a couple of times. Maybe someone can help me with my 93 Legacy, FWD, 148,000 mi. Last night it started making an irregular, metallic sounding tapping/rattling noise that seems to be coming from the lower part of the engine. By irregular I mean it's not rhythmic, it varies from several times a second to maybe a second or two between taps. I found that I was a quart low on oil, but adding a quart didn’t seem to make a difference - although it has been just about 2,000 miles and 2 months since my last oil change, and I never noticed using that much oil before. The noise wasn't there this morning when the engine was cold but I heard it again when I arrived at work, about 9 miles. I just tried changing the RPMs at idle, and above about 1,000-1,500 RPM I think it goes away, but I’m not positive because of the regular engine noise. When I let the idle back down, however, it started to make a racket. After doing that a few times, trying to find the point at which the noise abates, it stopped even at the regular idle of about 400 RPM, but I don’t suppose that magically fixed it for good. No idiot lights, temperature gauge is fine, seems to run fine - acceleration, etc., all normal. Oil looks fairly clean - no signs of coolant in it, and the coolant doesn’t look oily. Maybe the oil pump is bad? I'm hoping this sounds very simple to those who know more about engines than I do - maybe not easy or inexpensive, but simple. ... Sorry for the long post - I wanted to include as much info as possible so the resident experts can share their wisdom.