The 508 spec gets you better mpg and less dirty emissions. Gotta look at the bottle carefully. Mobil ESPX2 0w20 has that spec.
262k miles here on an M54B30 with 10k changes, Mobil 1, it's running great.
It should be fine. I use Mobil 1 and it's worked great.
using a heavier oil weight has been an old trick to help with oil consumption in Subarus for a long time now. I used to use Rotella 5w40 (before the reformulation) in my old 04 Baja Turbo and that particular oil was the best to keep the oil burning down.
I use Mobil one in Canada when it goes on sale synthetic 0W20 10 k intervals 13 yr old corolla 1.8 and 15 yr old tundra 5.7 350 k and 320 km ; no oil consumption work great
My regular since i think 2014 or so has been helix ultra 5w40 running in all my vehicles currently.
I run 0w30 in my F82 M4 as that's what BMW and Shell recommend.
You must use Mobil 1 0W40!
Expensive. I’d stick to Mobil 1 or Kirkland
Mobil 1 for me is like water in this car. I ran it for the longest time till I was tuned but switched over
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If choosing engine oil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare engine oil across these categories:
In March 2026 on PartReview, engine oil Mobil were overall better than Shell.
In March 2026 on PartReview, engine oil Mobil were overall more popular than Shell.
By vote balance, engine oil Mobil surpassed Shell:
By number of reviews, engine oil Mobil surpassed Shell:
In March 2026, according to PartReview, engine oil Mobil led more car-specific ratings than Shell:
Mobil are chosen by owners of cars such as: Chevrolet Camaro, Infiniti G, Lexus IS, Opel Astra, Volvo V70, Chevrolet Corvette, Chevrolet Silverado, Ford Focus, Ford Mustang, Ford Ranger, Hyundai Sonata, Hyundai Tucson, Hyundai Veloster, Mazda 6, Volkswagen Jetta, and others.
Shell are chosen by owners of cars such as: Honda Jazz, Subaru Outback, Subaru Impreza WRX, Subaru Legacy, Volkswagen Scirocco, and others.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of engine oil Mobil with: Castrol, LIQUI MOLY, MOTUL, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
Also available: comparisons of engine oil Shell with: Castrol, LIQUI MOLY, MOTUL, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.
You can also see who is better among other engine oil manufacturers: Mobil or Castrol, Mobil or LIQUI MOLY, Mobil or MOTUL, LIQUI MOLY or Castrol, Mobil or AMSOIL.
