[ToySub1946]

Op's stated car is 2015 FRS blue with 49,000 miles, bought used.
Opinion: Screw German cars, Japanese built are the worlds best at the moment, so enjoy your purchase.


Personal >>opinion<<, choice:

I drive a 2015 FRS blue with manual trans and currently 54,000 miles on it. Bought new.

I use Mobil One full synthetic 0W20 from Walmart...whichever Mobil One they have in stock. Comes in 5 quart container, not enough as car takes 5 1/2 quarts. So cheapest in the long term is to buy two 5 gallon containers, as buying a one quart container is expensive. Save remainder of container for next oil change. Always change oil at 7500 mile intervals.

Former auto tech here. The crush washers come in copper or aluminum. Guess what, one crush washer works for numerous oil changes.

I buy oil filter at Subaru Dealership if available, if it's a Sunday, oh well, get Fram's absolute best (Ultra ?) at Walmart.

I plan never to change oil in trans or diff as there's just no combustion in those areas.
I ain't gonna have the car like forever.

I may change the spark plugs somewhat after the 60,000 mile interval suggested. I think/hope I can do it myself with the exact, proper tools, leaning over the fenders and not jacking up the engine...we'll see.

Coolant change maybe after like five/ten ? years, and I'll use Prestone extended life concentrate 100%. (Buying the 50/50 mixtures is a total ripoff). Don't need blue color, screw that b.s. Green Prestone works just fine. Note: I've already added Prestone several times as this car eats coolant, mysteriously.