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Spare parts reviews ➔ All comparisons ➔ Shell ➔ IDEMITSU

Engine oil Shell or IDEMITSU

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Shell
IDEMITSU
Shell › Engine oil
QueenAlpaca
  • Exhaust smoke:
Rating 5.0

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.

Pros: keep oil burning down
Vehicle: Subaru
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IDEMITSU › Engine oil
Possible-Aerie-8828
  • Engine noise:
Rating 5.0

I buy 5 OE Toyota filters at a time from Amazon ( approximately $6 ea ) Purchase Ow-20 Idemitsu oil from NAPA ( ships free to my home ) in the cost saving 6gal box ( 24 qts ) for about $125 with their online coupon. Use this in both my Avalon and my Tundra- both run like a dream.

Pros: cars run like a dream, cost-saving
Vehicle: Toyota Avalon
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Shell › Engine oil
Familiar_Play_4915
  • Engine noise:
  • Exhaust smoke:
Rating 5.0

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.

Pros: healthy engine, no issues
Mileage: 370000 km
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IDEMITSU › Engine oil
ExtraGlutenPlzz
Rating 3.0

So if you review the virgin oil analysis database, it includes idemitsu 0w-20 and 5w-30 and for both, the TBN is rather weak in comparison to other more readily available blends, also, the viscosity at 9.5 cSt for a 30w, some 20w come close to that. Does any of that matter? Not a whole lot, but it shows that there's nothing special about the oil. Generally speaking, higher TBN is better.

Pros: nothing special about oil
Cons: TBN is rather weak
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Which engine oil to choose — Shell or IDEMITSU?

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:

Comparison of engine oil Shell and IDEMITSU
  1. PR Score.
  2. Overall ranking.
  3. Vote balance.
  4. Average rating.
  5. Number of reviews.
  6. Feature ratings.
  7. Car owners’ choice.

Which engine oil are better — IDEMITSU or Shell?

In March 2026 on PartReview, engine oil Shell were overall better than IDEMITSU.

  1. Shell received a PR Score of 94 out of 100, and IDEMITSU scored 97 points.
  2. Shell ranked 4 in the overall ranking, and IDEMITSU ranked 14.
  3. The average rating is higher for IDEMITSU (4.8) than for Shell (4.5).
  4. Engine oil IDEMITSU have better feature ratings than Shell:
    • Engine noise - owners believe, that this property for IDEMITSU is better than Shell.
    • Warning light - drivers claim, that this property for Shell is outperforms IDEMITSU.
    • Exhaust smoke - reviews suggest, that this property for IDEMITSU is preferred to Shell.

Which engine oil are more popular — Shell or IDEMITSU?

In March 2026 on PartReview, engine oil Shell were overall more popular than IDEMITSU.

By vote balance, engine oil Shell surpassed IDEMITSU:

  • For Shell, the ratio of positive (1007) to negative (62) votes is 945 votes.
  • For IDEMITSU, the ratio of positive (83) to negative (2) votes is 81 vote.

By number of reviews, engine oil Shell surpassed IDEMITSU:

Which engine oil do car owners prefer — Shell or IDEMITSU?

In March 2026, according to PartReview, engine oil Shell led more car-specific ratings than IDEMITSU:

Shell are chosen by owners of cars such as: Honda Jazz, Subaru Outback, Subaru Impreza WRX, Subaru Legacy, Volkswagen Scirocco, and others.

Engine oil IDEMITSU have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.

Other comparisons of engine oil

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 IDEMITSU 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.

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