My front main seal leaked, and I saw that I was losing oil pressure just as I was on a highway on ramp.   I had definitely driven with low oil for a few miles, but good oil pressure.   

So glad I noticed the dipping oil pressure gauge!

I replaced the crankshaft seal, and topped up the oil.

In startup, it sounded like the hydraulic valves ticked until they were filled with oil.

 

I have a new sound above 2000 rpm, well represented on the video.  

 

Any guesses?

 

 

Edited February 14, 20224 yr by mkoch
I made a typo

sounds like something rattling.  Something loose, on the outside of the engine / transmission?

 

Cut open the oil filter and have a look. 

GD

2 hours ago, GeneralDisorder said:

Cut open the oil filter and have a look. 

GD

Thank you for the response, and thank you for all the posts on ultimatesubaru.org!