Gear oil AMSOIL or RED LINE

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AMSOIL Gear oil

TBH, I recommend OEM fluid for the trans for this reason. It's too much of a minefield with hybrid fluids. I used to recommend Amsoil (I use it) but they no longer have the gear oil I use.

Pros: recommends Amsoil gear oil
Cons: no longer available
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RED LINE Gear oil

Under hard driving conditions per the manual reduction gear oil should be changed not just inspected. Almost all off us fall under hard driving. Search around some people have gotten better range out of higher quality gear oil redline I think.

Pros: better range
Vehicle: Nissan Leaf
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RED LINE Gear oil

It's hard to find GL4 gear oil anymore. The only real GL4 available in the States seems to be Redline. GL5 oils are generally harsher on brass synchros. I've been using Redline since 2007, when I bought my GTI, and it shifts just as well as it did back then.

Pros: shifts just as well
Cons: hard to find
Vehicle: Volkswagen
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AMSOIL Gear oil

Amsoil severe gear lasted until ~3200 km, but it started again, but much slower progression.

Pros: lasted until 3200 km
Cons: issue started again
Mileage: 3200 km
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RED LINE Gear oil

I had tried Redline MT90 to get rid of the intermittent grind into 2nd, but it made all shifting more difficult and always grind into 2nd. So I went back to OEM.

Cons: made shifting more difficult
Vehicle: Volkswagen Corrado
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Which gear oil to choose — AMSOIL or RED LINE?

If choosing gear oil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.

We compare gear oil across these categories:

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

Which gear oil are better — RED LINE or AMSOIL?

In March 2026 on PartReview, gear oil RED LINE and AMSOIL were roughly equal.

  1. AMSOIL received a PR Score of 95 out of 100, and RED LINE scored 80 points.
  2. AMSOIL ranked 2 in the overall ranking, and RED LINE ranked 1.
  3. The average rating is higher for AMSOIL (4.6) than for RED LINE (4.1).
  4. Gear oil AMSOIL have better feature ratings than RED LINE:
    • Smell - owners believe, that this property for AMSOIL is better than RED LINE.
    • Leaks - drivers claim, that this property for AMSOIL is outperforms RED LINE.
    • Noise - reviews suggest, that this property for AMSOIL is preferred to RED LINE.

Which gear oil are more popular — AMSOIL or RED LINE?

In March 2026 on PartReview, gear oil RED LINE were overall more popular than AMSOIL.

By vote balance, gear oil RED LINE surpassed AMSOIL:

  • For AMSOIL, the ratio of positive (38) to negative (2) votes is 36 votes.
  • For RED LINE, the ratio of positive (91) to negative (22) votes is 69 votes.

By number of reviews, gear oil RED LINE surpassed AMSOIL:

Which gear oil do car owners prefer — AMSOIL or RED LINE?

In March 2026, according to PartReview, gear oil AMSOIL and RED LINE have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.

Other comparisons of gear oil

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of gear oil AMSOIL with: MOTUL.

Also available: comparisons of gear oil RED LINE with: MOTUL.

You can also see who is better among other gear oil manufacturers: MOTUL or RED LINE, MOTUL or AMSOIL.

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