Never heard of Metrostreet filters. I would change that filter and use a Subaru oem or equivalent. Check your oil and make sure they didn’t drain your cvt trans fluid. You can do your own oil changes I’m sure.

 

I find that it's pretty common for auto manufacturers to change, substitute or combine filter part numbers over time. As for Subaru oil filters:

Subaru Service Seattle: Subaru Oil Filters Explained - All Wheel Drive Auto

Subaru practices lean manufacturing, and as a result if they can eliminate part numbers to keep things simple they will greatly lower their costs, but there are some unintended consequences sometimes. Nowhere is this more obvious than their oil filters and how they have changed, superseded and...

allwheeldriveauto.com

 

1. I wouldn't sweat the off-brand filter this time. BUT, maybe stick with a Subaru filter next time. Genuine Subaru filters have a higher bypass PSI setting than most filters. I believe WIX/Napa also sell a suitable filter. But really, nobody else does.

2. The 15A filter is the right one. The 160 filter is what comes installed from the Japanese factory, but is apparently only normally sold in Japan. The 15A is made in North America (by Fram).

3. The book for your 2015 says 5.1 quarts. Just buy a jug of 0W-20 full synthetic and put the whole thing in. Subarus are notorious for giving various readings on the dipstick depending on the exact location of where the vehicle is when the dipstick is pulled. For best results, check when the engine is cold and always try to have the vehicle parked in the same place.

4. I do not jack the Forester up for an oil change. There is plenty of room for me to get under there. I have a 2014 (same engine as your 2015) and a 2019 (different engine with a different oil capacity). No need for a jack on either.

When you change the oil, always replace the crush washer on the drain plug or else replace the plug with a quick-drain valve like a Fumoto. If you stick with the drain plug, use a 6-point socket, as the head is fairly soft.

 

1. I wouldn't sweat the off-brand filter this time. BUT, maybe stick with a Subaru filter next time. Genuine Subaru filters have a higher bypass PSI setting than most filters. I believe WIX/Napa also sell a suitable filter. But really, nobody else does.

2. The 15A filter is the right one. The 160 filter is what comes installed from the Japanese factory, but is apparently only normally sold in Japan. The 15A is made in North America (by Fram).

Thank you for your answer.
2. They should use the same part number if they are the same filter, or else put this info on their website so that when I search the part number, google search will return the info.

3. The book for your 2015 says 5.1 quarts. Just buy a jug of 0W-20 full synthetic and put the whole thing in. Subarus are notorious for giving various readings on the dipstick depending on the exact location of where the vehicle is when the dipstick is pulled. For best results, check when the engine is cold and always try to have the vehicle parked in the same place.

hmm, I may need to some more research on how to read the dipstick. Do you think I should add step B below to make it more accurate?
A. Pull out the dip stick and wipe it off the oil.
B. Do you think I should wait a little longer so that the oil on the wall of the pipe will drip to the bottom?
C. Insert the stick back into the pipe.
D. Pull the dipstick out again

4. I do not jack the Forester up for an oil change. There is plenty of room for me to get under there. I have a 2014 (same engine as your 2015) and a 2019 (different engine with a different oil capacity). No need for a jack on either.

I am able to change oil for regular sedan cars. As long as your arm is long enough. In case it is too hard, I use this trick:
without jackstand

When you change the oil, always replace the crush washer on the drain plug or else replace the plug with a quick-drain valve like a Fumoto. If you stick with the drain plug, use a 6-point socket, as the head is fairly soft.

In my experience, I have used the crush washer 3 times in the past without problem. If I see any small indication of leakage this time, next time I will remember to change the washer.[/QUOTE]