I will take some time to clarify errors I discovered thanks to @Aluvius95 and the more advanced grok AI than the rest.
The authentic “Honda Green Diesel Oil” only has ONE viscosity: 0W-30 (Full product name: Honda Diesel Oil 0W-30 ACEA C2/C3 or “Honda Green Oil 0W-30”) Common official Honda references:
- 08232-P99-D1LHE (1 liter)
- 08232-P99-D4LHE (4 liters)
This is the only oil that Honda sells and has sold with the “Green Diesel Oil” label for its 1.6 i-DTEC and 2.2 i-DTEC diesel engines (Civic, CR-V, HR-V, Accord, etc.) from approximately 2013 to today (2025). Where did the other viscosities I mentioned come from? They were my mistakes in mixing different products:
- 0W-20 → It is the “Honda Green Oil” but for gasoline and hybrid engines (Type 2.0, Ultra Green, etc.). It is not diesel.
- 0W-16 → It is another green oil from Honda but only for the latest gasoline/hybrid engines (for example, the 2.0 e:HEV of the Civic 2022+). It is also not diesel.
Therefore, when I talk about Green Diesel Oil, the correct and only viscosity is 0W-30 ACEA C2/C3.
The Honda Green Diesel Oil 0W-30 (and practically all “Honda Genuine” oils) is not manufactured directly by Honda but produced by major oil companies under an exclusive contract for Honda.
Who actually manufactures it?
- In Europe (including Spain and most countries where Green Diesel Oil is sold): It is manufactured by ENEOS (the largest oil company in Japan, owned by JX Nippon Oil & Energy). ENEOS has been the official supplier of all “Honda Genuine” oils for the European market for over 15 years.
- In Japan and some Asian markets: It is also produced by ENEOS, but with slightly different formulations.
- In the United States and Canada: There it is manufactured by ConocoPhillips or Idemitsu (depending on the year), but that oil is different (it is not the Green Diesel 0W-30).
How do we know for sure?
- In the official technical sheets of Honda Europe, the ENEOS brand appears as the manufacturer.
- The batch codes and original drums have internal references from ENEOS.
- When the Green Diesel Oil started to become scarce (2022-2024), Honda temporarily authorized the ENEOS ULTRA-S 0W-30 ACEA C2 as a direct substitute, which is literally the same oil but with an ENEOS label.
Clear summary: The Honda Green Diesel Oil 0W-30 = ENEOS manufactured exclusively for Honda It is the same base oil and additives as the ENEOS ULTRA-S 0W-30, but with a green Honda label and a considerably higher price. That is why many workshops and advanced users, when they cannot find the original, directly use ENEOS ULTRA-S 0W-30 C2 without any problem (and at half the price).
ENEOS ULTRA-S 0W-30 - ENEOS
To avoid extending, I can explain why the codes appear in ravenol, but in short, it is a promotional trick because it has some properties of the green diesel oil.
This oil is a special edition 0W-16 for very low friction diesel engines, launched by Honda only for some Asian markets (mainly Thailand, Indonesia, and Malaysia) from 2020-2021 and for very specific diesel engines (especially the 1.5 i-DTEC of the Asian Civic and some new generation Thai CR-Vs).