85 votes
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.
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.
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.
I have a 17 grand touring and I use idemitsu 0w/20 and purolator b9ss filters.
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.
Idemitsu 05-W30 from Unioil kasi I cant find Castrol for my 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.
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.
I have a Sohn kit and run Idemitsu engine oil in the engine and Idemitsu premix in the Sohn. Runs lovely and smooth and the original cat is still doing the job.
We use Idemitsu for engine oil and transmission and red line for front and rear diff. Red line makes a good fluid for the transmission also.
Write your review about engine oil IDEMITSU
Help others - share your experience with this part.
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
The brand is registered in Japan.
In March 2026, PartReview users have a positive opinion of IDEMITSU engine oil.
PR Score — 97 out of 100, based on 28 reviews and 85 votes. 27 positive reviews, 1 neutral review, 0 negative reviews. Average rating — 4.8 (out of 5). Vote balance: 83 up, 2 down.
In the ranking of the best engine oil this part is at position 14, behind Mannol and Total , but ahead of OEM Honda and Eneos.
Users also evaluated the qualities of IDEMITSU engine oil:
See which car brands and models owners choose IDEMITSU engine oil for. Below are car-specific ratings where this part is in the Top-3:
There are 31 comparison of IDEMITSU engine oil with other manufacturers on PartReview.
In particular, see which engine oil are better: IDEMITSU or OEM FORD, IDEMITSU or Lucas, IDEMITSU or Motorcraft, IDEMITSU or OEM Audi, Kendall or IDEMITSU .
