vs
Engine oil Motorex or IDEMITSU
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
At the end of the day, pretty much anything in spec will work fine.
That being said, I did a bunch of research for my V85 and determined that Motorex Cross-Power does the best in high demand applications. Air cooled engines can have a really wide temp range. That's what I use.
Pros: best in high demand
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
I have a 17 grand touring and I use idemitsu 0w/20 and purolator b9ss filters.
Vehicle:
Mazda 6
Part number: B9SS
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
Idemitsu 05-W30 from Unioil kasi I cant find Castrol for my Mazda
Cons: cant find Castrol
Vehicle:
Mazda
Idemitsu is responsible for the oil that powered the Mazda 787b; they know the rotary like no other. I exclusively use their synthetic 20w50 and premix.
Pros: knows rotary like no other
Regarding brands, if you want to stick with factory oil without dealer price, Idemitsu is the brand to get. I emailed Mazda corporate and they said Idemitsu is the OEM for their oil.
Pros: OEM for Mazda oil
Vehicle:
Mazda 3
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
It takes a “synthetic blend” of motorex 15W50 oil. And uhh yeah works good I guess, don’t have to change it too often, and as far as performance goes, it doesn’t really matter because I’m on restricted power anyways so yeah ????♂️
Pros: works good
Cons: restricted power
Write your review
Help others - share your experience with this part.
Comparisons
Show all
Voted AGAINST engine oil RAVENOL on the rating page
The brake pads OEM Alfa Romeo got the first review!
The brake caliper OEM BMW got the first review!
The brake pads OEM Infiniti got the first review!
For wiper blades PIAA already 100 reviews.
For battery Energizer already 25 reviews.
In the rating best water pump already 12 brands participate!
In the rating best timing belt already 13 brands participate!
In the rating best head gasket already 3 brands participate!
In the auto rating oil filter for Volkswagen Passat already 5 brands participate!
In the auto rating brake pads for Mazda 5 already 10 brands participate!
In the auto rating tires for Subaru Outback already 50 brands participate!
For cabin filter Fram already 25 reviews.
Voted AGAINST engine oil RED LINE on the rating page
Voted AGAINST engine oil PENNZOIL on the rating page
Which engine oil to choose — Motorex 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:
- PR Score.
- Overall ranking.
- Vote balance.
- Average rating.
- Number of reviews.
- Feature ratings.
- Car owners’ choice.
Which engine oil are better — IDEMITSU or Motorex?
In March 2026 on PartReview, engine oil IDEMITSU were overall better than Motorex.
- Motorex received a PR Score of 84 out of 100, and IDEMITSU scored 97 points.
- Motorex ranked 27 in the overall ranking, and IDEMITSU ranked 14.
- The average rating is higher for IDEMITSU (4.8) than for Motorex (4.3).
-
Engine oil IDEMITSU have better feature ratings than Motorex:
- Engine noise - owners believe, that by this property Motorex does not differ from IDEMITSU.
- Exhaust smoke - drivers claim, that this property for IDEMITSU is outperforms Motorex.
Which engine oil are more popular — Motorex or IDEMITSU?
In March 2026 on PartReview, engine oil IDEMITSU were overall more popular than Motorex.
By vote balance, engine oil IDEMITSU surpassed Motorex:
- For Motorex, the ratio of positive (44) to negative (8) votes is 36 votes.
- For IDEMITSU, the ratio of positive (83) to negative (2) votes is 81 vote.
By number of reviews, engine oil IDEMITSU surpassed Motorex:
- For engine oil Motorex there are 16 reviews: 12 positive, 4 neutral, 0 negative.
- For engine oil IDEMITSU there are 28 reviews: 27 positive, 1 neutral, 0 negative.
Which engine oil do car owners prefer — Motorex or IDEMITSU?
In March 2026, according to PartReview, engine oil Motorex and IDEMITSU have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
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 Motorex with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.
Also available: comparisons of engine oil IDEMITSU 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.