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.
No, but I did keep 2 quarts of oil and a gallon jug of water. My Mazda Protege was notorious for burning oil and overheating
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 prefer synthetic myself in my CX50 Turbo, but Mazda engines aren't very picky overall.
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.
zu viel Kurzstrecke. mach mal nen Ölwechsel und lass den wagen dann mal richtig auf Temperatur kommen.
they only say you can do that with their Mazda-branded oil. That stuff tends to be expensive.
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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 OEM Mazda.
In March 2026 on PartReview, engine oil Shell were overall more popular than OEM Mazda.
By vote balance, engine oil Shell surpassed OEM Mazda:
By number of reviews, engine oil Shell surpassed OEM Mazda:
In March 2026, according to PartReview, engine oil Shell led more car-specific ratings than OEM Mazda:
Shell are chosen by owners of cars such as: Honda Jazz, Subaru Outback, Subaru Impreza WRX, Subaru Legacy, Volkswagen Scirocco, and others.
OEM Mazda are chosen by owners of cars such as: Mazda 3, and others.
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 OEM Mazda 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.
