The industry's first new phosphorus-free, ash-free oil, idemitsu AshFree, has been developed to extend the lifespan of DPFs in commercial diesel engine vehicles*1

idemitsu AshFree (20L can)

Conventional diesel engine oil used in truck and bus engines contains metal additives to improve cleanliness and wear resistance. On the other hand, these metal additives turn into ash, clogging the DPF, and causing trouble, which has been a long-standing issue.
In order to fundamentally solve this problem, based on the concept of not producing ash rather than producing it, we have developed a diesel engine oil that does not use metal additives that create ash, using our unique additive formulation technology. We worked hard and succeeded ^*4.

[idemitsu AshFree features (expected effects)]

1. DPF life extension

Ash does not accumulate in the DPF, extending the life of the DPF (reducing maintenance costs such as DPF replacement and cleaning).

2. Improving working hours

Reduces the labor time and burden spent on manual DPF regeneration.

3. Reduce fuel consumption

Reduces the fuel used for regeneration to suppress the increase in the number of DPF regenerations.

4. Excellent high temperature cleanliness

It has excellent high-temperature cleanliness and low evaporation (compared to our DH-2 oil), and can also be expected to suppress deposits (EGR, etc.).

5. Contribution to the environment

This will lead to a reduction in CO₂ emissions by reducing the number of times DPF is regenerated. In addition, by not using phosphorus, it is expected that catalyst poisoning will be suppressed and the need for catalyst replacement will be reduced.

Since our founding in 1911, we have continued to focus on ultra-precise designs and refined our lubricant technology. Going forward, our company will continue to use this technological strength to contribute to solving social issues, such as improving the working environment and reducing CO₂ emissions.