Hydrogen Carbon Cleaning Service for Mazda Demio Diesel (S5-DPTS Engine) in Ishikawa Prefecture

孝一田﨑
Jul 17
7 min read

We recently welcomed a customer’s vehicle for a specialized maintenance service here in Ishikawa Prefecture!

Our mission this time: A full Hydrogen Gas Carbon Cleaning service paired with a D-Pine Multi Cleaner treatment on a Mazda Demio Diesel (S5-DPTS engine).

Here are the specs and details of the vehicle:

Current Mileage: Approx. 105,700 km
Engine: Mazda SKYACTIV-D (S5-DPTS) – 1,498 cc, Water-cooled Inline 4-cylinder DOHC 16-valve Turbo Diesel
Max Power output: $105 \text{ ps} \ (77 \text{ kW}) / 4,000 \text{ rpm}$
Max Torque: $25.5 \text{ kgf}\cdot\text{m} \ (250 \text{ N}\cdot\text{m}) / 1,500\text{–}2,500 \text{ rpm}$

Mazda’s SKYACTIV-D lineup is highly praised for its torque and efficiency, but like many modern diesels, they are prone to carbon buildup over time.

⚠️ The Problem: Engine Check Light (CEL) & DPF Clogging

The owner brought the car to us because the engine check light (CEL) had illuminated.

Although the dealer had previously reset the warning light, it turned back on almost immediately. The vehicle also had a history of EGR (Exhaust Gas Recirculation) valve replacement.

To address the potential DPF (Diesel Particulate Filter) soot clogging and restore the engine’s breathability, we recommended a dual-action approach: Hydrogen Gas Carbon Cleaning combined with D-Pine Multi Cleaner.

🔧 The Cleaning Process: Step-by-Step

1. Fuel Additive Injection

First, we carefully measured the specified amount of D-Pine Multi Cleaner (a premium fuel system additive designed to dissolve stubborn deposits) and poured it directly into the fuel tank.

2. Pre-Service Diagnostics & Setup

Before introducing the hydrogen gas, we conducted thorough checks of:

Engine noise level
Vibration levels
Exhaust emissions from the muffler

3. Gradual Hydrogen Gas Injection

With the baseline checks complete, we began injecting hydrogen gas into the air intake.

We started at a conservative flow rate of 100 L/h.
As we monitored the engine's real-time response, we gradually increased the hydrogen flow to safely and effectively break down the carbon deposits inside the combustion chamber and exhaust system.

↓↓↓ [Customer Impression / Test Drive Review Below]

石川県-マツダデミオディーゼル・S5-DPTS型水素ガスカーボンクリーニング施工実施 — 石川県でのマツダデミオディーゼル（S5-DPTS型）の水素ガスカーボンクリーニング施工中。

🚗 [During-Service Impressions & Real-Time Changes]

To ensure the D-Pine Multi Cleaner quickly circulated through the fuel system, we revved the engine a few times.

During this initial check, we observed a slight flutter/hesitation in the tachometer needle as it dropped back down from 2,000 rpm. We connected our diagnostic OBD scanner, reset the Engine Check Light (CEL), and closely monitored the vehicle's parameters as the cleaning process began.

Here is how the S5-DPTS engine responded during the 60-minute hydrogen therapy:

5 Minutes In: Holding a hand near the exhaust tailpipe, we could already feel noticeable moisture. However, the overall exhaust pressure felt slightly weak, and the airflow from the tailpipe was somewhat uneven and interrupted. We proceeded with the service, aiming to resolve these symptoms by carefully adjusting the hydrogen gas flow rate.
10 Minutes In: Steam began rising from the exhaust pipe, showing that the hydrogen was actively binding with carbon deposits and turning them into water vapor.
15 Minutes In: Water droplets started to form and accumulate at the edge of the exhaust outlet.
20 Minutes In: A significant improvement in NVH (Noise, Vibration, and Harshness). Engine noise and vibrations noticeably decreased, settling into a much quieter idle. At this point, we locked in the optimal hydrogen flow rate to maintain this stable cleaning phase.
45 Minutes In: We checked the tailpipe exhaust flow again. The weak pressure and uneven, interrupted exhaust flow observed at the start of the service were completely gone. The exhaust pressure felt strong and steady.
We then blipped the throttle to check the instrument cluster. The needle flutter previously seen when dropping from 2,000 rpm had disappeared. The tachometer needle now returned to idle smoothly, and the throttle response felt much lighter and crisper.
50 Minutes In: The moisture at the exhaust tip began to dry up, indicating that the bulk of the loose carbon buildup had been successfully purged.
60 Minutes (Completion): After fine-tuning the hydrogen levels for the final stretch, the engine idle, sound, vibration, and exhaust flow were all perfectly stable. We concluded the cleaning session.

Throughout the entire 60-minute process, the engine check light did not turn back on.

We wrapped up by explaining how to use the remaining D-Pine Multi Cleaner and handed it over to the customer for their next fuel fill-ups.

👇 [Post-Service Impressions & Test Drive Results]

石川県-マツダデミオ水素ガスカーボンクリーニング施工時に使用したディーパインマルチクリーナー

石川県-マツダ CX-5 SKYACTIV-D・SH-VPTS型水素ガスカーボンクリーニング施工時に同時施工したディーパインマルチクリーナー

[Product Focus: D-PINE Multi Cleaner]

As you can see from the image materials provided above, the D-PINE Multi Cleaner used in this service is specifically designed to target the weak points of modern clean diesel engines. It delivers exceptional preventative effects for the entire fuel line (including injectors), DPF, EGR, and EGR coolers.

While it comes with a slightly higher price tag, a single bottle contains enough capacity for two complete treatments in standard-sized passenger vehicles. This makes it an incredibly cost-effective investment for suppressing soot accumulation and preventing major DPF clogging troubles before they start.

🏁 [Post-Service Notes & Customer Feedback]

Since we did not perform a post-service test drive on the road this time, we weren't able to get immediate driving impressions from the owner.

However, the customer was able to verify the improved engine responsiveness at idle and confirmed that the engine check light remained off. We hope to hear their feedback on the car’s on-road performance and drivability in the near future!

⚠️ Why SKYACTIV-D Owners Need to Worry About DPF & Injectors (Especially Over 70,000 km)

At our shop, we receive a high volume of inquiries and bookings for Mazda SKYACTIV-D engine maintenance.

We notice a huge spike in concerns—specifically regarding DPF (Diesel Particulate Filter) soot buildup and fuel injector clogging—once these vehicles pass the 70,000 km mark.

The Reality of Modern Clean Diesel Engines

To meet strict emissions regulations, modern clean diesel vehicles are equipped with:

DPF (Diesel Particulate Filter): Catches and burns off soot.
EGR (Exhaust Gas Recirculation) System: Recirculates exhaust gas to lower combustion temperatures and reduce NOx.

While these systems are great for the environment, they inevitably restrict exhaust efficiency and put a heavy thermal and physical load on the engine. Over time, sticky carbon and soot build up inside the intake, EGR valve, and combustion chambers.

💡 Our Preventive Solution: Hydrogen Cleaning + Multi Cleaner

To combat these issues before they turn into major headaches, we highly recommend our dual-preventive maintenance:

Hydrogen Gas Carbon Cleaning: This process cleans the inside of the combustion chamber, restoring optimal combustion and exhaust efficiency. By ensuring a cleaner, more complete burn, it drastically reduces the amount of raw carbon (soot) traveling downstream to the EGR and DPF.
D-Pine Multi Cleaner (Fuel System & DPF Additive): For those worried about injector spray patterns, DPF clogging, and EGR health, running a multi-cleaner through the fuel system at the same time is highly recommended. It targets the fuel lines and injectors directly while helping lower the regeneration temperature of the DPF.

⚠️ Crucial Warning: Don't Wait for the DPF Light! Once your DPF warning light turns on because the filter is completely blocked, hydrogen carbon cleaning and fuel additives can no longer work their magic.Replacing or repairing clogged DPFs, EGR valves, or common-rail injectors can cost thousands of dollars in dealer repair bills. Preventive maintenance is your best defense against these high costs.

🚗 Keep Your Clean Diesel Happy and Healthy!

Show your car some love, and it will reward you on the road.

Clean diesels offer incredible fuel economy, massive low-end torque that makes driving incredibly fun, and lower fuel costs compared to gasoline. With regular, proactive maintenance, you can enjoy these benefits and keep your Mazda running smoothly for years to come.

If you are in or near Ishikawa Prefecture and want to keep your diesel engine in peak condition, feel free to contact us today!

At e-BLUE, we never treat any two vehicles the same. We carefully inspect and monitor the specific condition of each individual engine throughout the entire process, custom-tuning the hydrogen delivery rate to match its needs. This tailored approach drastically maximizes the overall cleaning efficiency and delivers far superior results.

「一台一機」に合わせたオーダーメイド施工 e-BLUE が選ばれる理由！。同じ車種、同じエンジンでも、コンディションやカーボンの溜まり方は、一台ごとに全く異なります。 e-BLUEでは、多数の検証を重ねた施工を実施。 — 一台一台に合わせたオーダーメイドのエンジンクリーニング、e-BLUEが選ばれる理由！同じ車種でもコンディションに合わせて最適な施工を提供し、圧倒的な洗浄効果を実現します。

If you have any questions or would like to learn more about our services, please feel free to reach out to us at any time.

Thank you for your continued support of e-BLUE and our Hydrogen Gas Carbon Cleaning services. We look forward to helping you restore your engine's peak performance!

For bookings and inquiries, you can reach us by phone or email. If you send us an email, we will get back to you as soon as we review your message. Thank you for your patience!