I had a 2017 Forester with 175k miles on it and only used factor oil and never had any issues. I did not do any off road stuff and it was only a premium model, not a wilderness model. I don’t think it matters as long as you change it regularly.
The recommended Castrol isn't bad, but I've had better success with Mobil1 and Liquid Moly.
Try using liqui moli engine oil, change the air filter too.
After completing the 1000 km run in and going through the first service where I got Cepsa xtar 10w40 oil, the gearbox remained hard, compared to my previous F650 bmw.
Did some digging regarding engine oil and how I could improve my gear shifting experience, engine smoothness and durability and the choice was either Motul 7100 or LiquiMoly Street Race 10w40. Decided on Liqui Molly and definitely I am noticing much smoother gear shifts and maybe even less vibration. I am surprised. The change is definitely noticeable.
5w40 liquidmoly
Changed ours at 3k and will change again at 6k. After that it’s every 5k. Use Subaru oil and filters.
Imo Mobil 1 is mid grade at best. Liqui-moly is the only thing I’ve used for the last 5 years, I too started with Mobil 1, then switched to liquimoly (same weight) and the engine was immediately quieter, smoother, and ran cooler.
my 2017 Passat got totaled in a accident this week, was at 205062 miles running strong off Liqui Molygen 5w-40.
My GL550 has about 106k miles on it, just did an oil change with LiquiMoly 0w-40 and 2 bottles of LiquiMoly ceratec. Drove it kind of hard for a minute or so. Then noticed when I got back it had this noise.
Liqui moly apparently it’s not good oil, they’re just good at marketing
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