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Spare parts reviews ➔ All comparisons ➔ RED LINE ➔ IDEMITSU

Engine oil RED LINE or IDEMITSU

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RED LINE
IDEMITSU
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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IDEMITSU › Engine oil
random-guy1947
Rating 4.0

This is normal. Wait till it gets below 1k rpm. Modern engines do not need a lot of time to idle after cold start, the ECU handles it. Although, for a few kilometres, do not push very hard. The engine oil (0w-20 idemitsu) is thin, and needs time to lubricate well.

Pros: thin, needs to lubricate
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RED LINE › Engine oil
fat biker
  • Engine noise:
Rating 4.0

On chilly winter mornings (SF Bay Area) the car did not like reverse or first gears. Subsequently switched to Red Line engine oil. More power, better mileage.

Pros: more power, better mileage
Cons: car did not like gears
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RED LINE › Engine oil
Capital-Neat-6
  • Engine noise:
  • Exhaust smoke:
Rating 5.0

Ran Redline 5w40 when it became purely a summer car in ~2013. ... Not seals are leaking, no issues of any form. Car has been Cobb stage 2 91oct tuned (OTS, not pro-tuned) almost 14 years, with a Crawford v2 AOS, Killer B oil pickup + windage tray being the only reliability mods, and it doesn't burn a single molecule of oil.

Pros: no leaks, no issues, no oil consumption
Vehicle: Subaru
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IDEMITSU › Engine oil
NefariousN1nja
Rating 5.0

Switch to Idemitsu ( Japanese oil ) - Manufacturers for genuine and even does factory fill for many, they are very premium oils with starting segment already beating the top shelf of alternative brands.

Pros: premium oils, beating alternative brands
Vehicle: Toyota
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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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RED LINE › Engine oil
saaber2
  • Engine noise:
Rating 2.0

Engine was noisier with the mix vs. the previously used redline 5w40. Iron levels are up at 6.3 ppm/1000 miles Oil usage increased by 1/2 quart over the redline 5w40 TBN/TAN levels are worse than 5w40 at comparable mileage

Cons: Engine was noisier, iron levels up
Mileage: 5000 km
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Which engine oil to choose — RED LINE 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 RED LINE 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 RED LINE?

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

  1. RED LINE received a PR Score of 94 out of 100, and IDEMITSU scored 97 points.
  2. RED LINE ranked 9 in the overall ranking, and IDEMITSU ranked 14.
  3. The average rating is higher for IDEMITSU (4.8) than for RED LINE (4.6).
  4. Engine oil IDEMITSU have better feature ratings than RED LINE:
    • Engine noise - owners believe, that this property for IDEMITSU is better than RED LINE.
    • Exhaust smoke - drivers claim, that by this property RED LINE does not differ from IDEMITSU.
    • Warning light - reviews suggest, that this property for RED LINE is preferred to IDEMITSU.

Which engine oil are more popular — RED LINE or IDEMITSU?

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

By vote balance, engine oil RED LINE surpassed IDEMITSU:

  • For RED LINE, the ratio of positive (232) to negative (13) votes is 219 votes.
  • For IDEMITSU, the ratio of positive (83) to negative (2) votes is 81 vote.

By number of reviews, engine oil RED LINE surpassed IDEMITSU:

Which engine oil do car owners prefer — RED LINE or IDEMITSU?

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

RED LINE are chosen by owners of cars such as: Audi S3, 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 RED LINE with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, OEM Toyota, Mannol.

Also available: comparisons of engine oil IDEMITSU with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, 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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