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Spare parts reviews ➔ All comparisons ➔ IDEMITSU ➔ OEM Subaru

Engine oil IDEMITSU or OEM Subaru

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IDEMITSU
OEM Subaru
OEM Subaru › Engine oil
CRYPTIC_SUNSET
  • Exhaust smoke:
Rating 4.0

My wife\u2019s 2012 Impreza is at 195k miles and I switched it to 0w-30 and then 5w-30 due to oil consumption. Was burning a quart every 1K miles on 0w-20, burns half that on 5w-30. I\u2019m actually considering going thicker.

Pros: burns half that
Cons: oil consumption
Mileage: 195000 km
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OEM Subaru › Engine oil
ajuscojohn
Rating 4.0

The dealership here itself was using 5w-30 as the default for oil changes even though 0w-20 is stamped on the filler cap. After checking myself that Subaru said that would be OK, I started using it too for my own changes just to avoid flipping back and forth -- though I have no idea if that would be a problem. In any case, the Forester seems happy, even if the mileage may have dipped slightly.

Pros: Forester seems happy
Cons: mileage may have dipped
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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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OEM Subaru › Engine oil
Bai13579
Rating 4.5

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.

Pros: no issues, engine longevity
Mileage: 175000 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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OEM Subaru › Engine oil
Tyesokay
  • Engine noise:
Rating 1.0

Do not listen to them. I have a 2015 forester non turbo I used 5w30 and had all kinds of problems id get codes for over advanced timing on one bank and under advanced on the other, I was getting power loss going uphill, weird chattering noise.

Cons: power loss, weird noise
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Which engine oil to choose — IDEMITSU or OEM Subaru?

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 IDEMITSU and OEM Subaru
  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 — OEM Subaru or IDEMITSU?

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

  1. IDEMITSU received a PR Score of 97 out of 100, and OEM Subaru scored 81 point.
  2. IDEMITSU ranked 14 in the overall ranking, and OEM Subaru ranked 21.
  3. The average rating is higher for IDEMITSU (4.8) than for OEM Subaru (3.9).
  4. Engine oil IDEMITSU have better feature ratings than OEM Subaru:
    • Engine noise - owners believe, that this property for IDEMITSU is better than OEM Subaru.
    • Exhaust smoke - drivers claim, that this property for IDEMITSU is outperforms OEM Subaru.

Which engine oil are more popular — IDEMITSU or OEM Subaru?

Engine oil IDEMITSU and OEM Subaru were equally popular according to data in March 2026.

By vote balance, engine oil IDEMITSU surpassed OEM Subaru:

  • For IDEMITSU, the ratio of positive (83) to negative (2) votes is 81 vote.
  • For OEM Subaru, the ratio of positive (77) to negative (17) votes is 60 votes.

By number of reviews, engine oil OEM Subaru surpassed IDEMITSU:

Which engine oil do car owners prefer — IDEMITSU or OEM Subaru?

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

OEM Subaru are chosen by owners of cars such as: Subaru Forester, Subaru Impreza, 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 IDEMITSU with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.

Also available: comparisons of engine oil OEM Subaru with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.

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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