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.
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.
shell long ride sulit for honda click
I am using 15W40 Shell Oil for the last 8 years. No issues. 160k Kms on the Odometer
I have always used shell 10w-40 and did regular oil changes around 4-4.5k. Faced no issues what so ever, engine was still healthy, no oil consumption, almost same performance.
I run rotella T6 5w-40. Have for 120k miles and will for the next 120k
At the end of the day, pretty much anything in spec will work fine.
That being said, I did a bunch of research for my V85 and determined that Motorex Cross-Power does the best in high demand applications. Air cooled engines can have a really wide temp range. That's what I use.
Ive used T6 with good results. The major drawback with T6 is foaming, it's less than great in that regards.
A mi shell no me resulto buena.
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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 Shell were overall better than Motorex.
In March 2026 on PartReview, engine oil Shell were overall more popular than Motorex.
By vote balance, engine oil Shell surpassed Motorex:
By number of reviews, engine oil Shell surpassed Motorex:
In March 2026, according to PartReview, engine oil Shell led more car-specific ratings than Motorex:
Shell are chosen by owners of cars such as: Honda Jazz, Subaru Outback, Subaru Impreza WRX, Subaru Legacy, Volkswagen Scirocco, and others.
Engine oil Motorex have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of engine oil Shell with: Mobil, Castrol, LIQUI MOLY, MOTUL, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol.
Also available: comparisons of engine oil Motorex with: Mobil, Castrol, LIQUI MOLY, MOTUL, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol.
You can also see who is better among other engine oil manufacturers: Mobil or Castrol, Mobil or LIQUI MOLY, Mobil or MOTUL, Mobil or Shell, LIQUI MOLY or Castrol.
