Engine oil Shell or AMSOIL

PartReview Score

Rank #4 in ranking

944

325

351

4.5

Engine noise

4.3

Exhaust smoke

4.2

Warning light

4.3

Owners' choice:

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #6 in ranking

860

300

328

4.5

Engine noise

4.4

Exhaust smoke

3.9

Warning light

4.5

Owners' choice:

Reviews

All

Shell

AMSOIL

AMSOIL › Engine oil

jumelhermoso 27 Jan 2026, 08:18

Rating 4.0

Fellow mu-X owner here! If you're thinking about upgrading from the standard Isuzu Genuine Motor Oil 10W-30, check out the ZIC X7 Diesel 10W-30 Fully synthetic. I used Amsoil Turbo Truck 5w40 too (10k km interval) but it's expensive for my Garage queen mux haha. Mobil Delvac1 5W-40 is good as well.

Pros: Fully synthetic

Cons: expensive

Vehicle: Isuzu

Mileage: 10000 km

Shell › Engine oil

QueenAlpaca 23 Jan 2026, 22:12

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

AMSOIL › Engine oil

Swordfish2007 20 Jan 2026, 23:40

Engine noise:

Rating 5.0

I have Signature in my 25. Smoothed out the engine noises quite a bit.

Pros: smoothed engine noises

Shell › Engine oil

Used-Computer-2572 20 Jan 2026, 22:15

Rating 4.0

My regular since i think 2014 or so has been helix ultra 5w40 running in all my vehicles currently.

Pros: good and vfm

Cons: not good

Shell › Engine oil

Dre9872 17 Jan 2026, 17:51

Rating 5.0

I run 0w30 in my F82 M4 as that's what BMW and Shell recommend.

Pros: BMW and Shell recommend

Vehicle: BMW M4

AMSOIL › Engine oil

JoeBuyer 15 Jan 2026, 20:20

Engine noise:

Rating 4.0

Engine noise is a little, well noisy, mine is less rumbly/vibrationy after I changed my oil and used Amsoil Hybrid oil. I can’t generally feel anything when the engine kicks on now, before I could definitely feel it every time it kicked on.

Pros: less rumbly/vibrationy

Cons: engine noise noisy

Vehicle: Toyota Camry

AMSOIL › Engine oil

Alternative_Wash1407 13 Jan 2026, 18:47

Rating 4.0

I switched oil to AMSOIL signature series synthetic, from everything I read, it out performs other oils, used to use Mobil 1

Pros: out performs other oils

Mileage: 88000 km

AMSOIL › Engine oil

NDALLASFORTY 10 Jan 2026, 14:23

Rating 5.0

My 2016 GT350R has almost 25K miles and has never needed oil between changes. I use Amsoil every 5000 miles, sooner depending on track abuse.

Pros: never needed oil

Cons: track abuse

Vehicle: Ford

Mileage: 25000 km

AMSOIL › Engine oil

mcurt9310 16 Jan 2026, 04:11

Rating 3.0

My biggest regret, not swapping out the shitty 0w-20 factory filled oil for some 5w-30 Amsoil, Motul, or Pennzoil Ultra platinum the moment I took it home. Don\u2019t wait till 1k miles.

Cons: shitty factory filled oil

Mileage: 1000 km

AMSOIL › Engine oil

USNPC5 12 Dec 2025, 14:25

Rating 1.0

Get a catch can but that mobile 1 oil you are using is for shit . Amsoil is best for mustangs and the best for that matter period it\u2019s cost but you can run it 25k

Pros: Amsoil is best

Cons: Mobile 1 is shit

Vehicle: Ford Mustang

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Show all

Which engine oil to choose — Shell or AMSOIL?

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 AMSOIL

PR Score.
Overall ranking.
Vote balance.
Average rating.
Number of reviews.
Feature ratings.
Car owners’ choice.

Which engine oil are better — AMSOIL or Shell?

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

Shell received a PR Score of 94 out of 100, and AMSOIL scored 93 points.
Shell ranked 4 in the overall ranking, and AMSOIL ranked 6.
The average rating is higher for AMSOIL (4.5) than for AMSOIL (4.5).

Which engine oil are more popular — Shell or AMSOIL?

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

By vote balance, engine oil Shell surpassed AMSOIL:

For Shell, the ratio of positive (1007) to negative (62) votes is 945 votes.
For AMSOIL, the ratio of positive (930) to negative (69) votes is 861 vote.

By number of reviews, engine oil Shell surpassed AMSOIL:

For engine oil Shell there are 351 review: 325 positive, 16 neutral, 10 negative.
For engine oil AMSOIL there are 328 reviews: 300 positive, 15 neutral, 13 negative.

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

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

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

AMSOIL are chosen by owners of cars such as: Honda S2000, Toyota 4runner, and others.

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, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota, Mannol, RAVENOL.

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

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.