What you are driving is a "spare car"
The subaru dipstick are flaky and hard to get a consistent read.
The notch above the top hole is for FULL HOT level; Never EVER go above this.
Make sure you are on level ground you a slight tilt ( @Roll more than pitch) will make the difference between 1/3 qt low and a 1/3 qt over reading.
You may just be cleaning up carbon and mineral deposits from years of conservative driving.
If you have no - belt record of service, then get to that ASAP.
You need the major idler replaced too. They fall apart.
Surprised yours is running, it must have been serviced.
There are kits that include everything.
Hard pa[rt is getting the plastic covers off - the small capscrew fasteners are usually corroded into the aluminum.
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After a few days of fooling with it, I realize I have a vacuum leak. The seller sold it on the cheap.. probably because his P0420 code couldn't pass the inspection. I fooled with it enough I got it to pass inspection. And if you saw how I presently have a "patch" on the vacuum leak intake tube (there is a split in the accordion part) you would LOL. And I'm getting that is what caused the P0420 . If that doesn't fix it: Rear 02 sensor, .... I'll mention it to them when they do the belt because I don't have any service records and this car cost $700.
The crank position sensor went out on it and left me stranded. Happy Birthday.
The intake tube costs https://www.carparts.com/details/Su...0TGOxeP5TseN1jhEMjhoCIOcQAvD_BwE&gclsrc=aw.ds
I would just buy some 3" clamps.