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  • Better engine protection
    Shell Helix Diesel HX7 works harder to prevent soot deposits than conventional oils.
  • Longer protection thanks to enhanced oxidisation resistance
    Up to 19% more protection than other synthetic-technology leading brands tested.

The power of cleaning for an efficient engine

Shell Helix Diesel HX7 motor oil uses special Active Cleansing Technology to help diesel engines operate efficiently. Soot from diesel combustion can increase an oil’s viscosity and force the engine to work harder. Shell Helix Diesel HX7 is designed to remove soot from engine surfaces without a large change in its viscosity. The oil actively cleans the engine and continues to flow quickly, which helps the engine to operate more efficiently.

In studies carried out by an independent research agency, drivers said that their cars felt more responsive after a Shell Helix Diesel HX7 oil change. The oil in a clean engine has improved access to surfaces, so that the engine is more responsive and better protected.

The excellent cleaning power and shear and oxidation stability of Shell Helix Diesel HX7 mean that it goes on delivering its benefits throughout the oil-change interval.

Shell Helix Diesel HX7 is specifically formulated for turbocharged and intercooled, direct-injection, high-performance diesel engines that are fitted with blow-by-gas recirculation and without particulate filters. The oil meets vehicle manufacturers’ severe-service specifications.

Drivers felt their cars were more responsive after a Shell Helix Diesel HX7 oil change. Driving in Istanbul, Turkey, is tough, as it has one of the world’s most severe start–stop urban cycles. Drivers of a variety of cars were asked about their driving experiences in the city by an independent research agency.

Then the oil in their cars was changed. In a blind test, more than half of the 147 drivers whose cars received Shell Helix Diesel HX7 noticed that their cars were more responsive to drive. Typical comments included: “The engine runs more comfortably” and “My car’s power has improved.”

Proven to keep your engine cleaner for longer

Soot and sludge can build up in diesel engines, reduce engine performance and prevent the oil from protecting the engine components. Tests in independent laboratories showed that Shell Helix Diesel HX7 oil can remove the sludge from a diesel engine. The engine was run with normal motor oil for a typical oil-change interval (125 hours), and sludge built up.

The oil was then replaced with Shell Helix Diesel HX7, and the engine was run again for a similar period. An immediate clean-up effect was seen with Shell Helix Diesel HX7, and, although it contained soot from the previous oil, the Shell Helix Diesel HX7 went on cleaning the engine for the entire test interval.

Shell Helix tests

To clean and protect an engine, the oil must continue to perform until it is removed when the car is serviced. With some manufacturers recommending longer service intervals, an oil’s ability to stay fit is even more important. Throughout the oil’s life, it has to disperse more and more dirt – keeping it locked away and preventing it from being redeposited in the engine.

Our scientists perform a variety of tests that measure the ability of Shell Helix oils to resist breakdown and disperse dirt. We also test our competitors’ oils, so that we can benchmark our lubricants and demonstrate the benefits of using Shell Helix oils.

Why you should use Shell Helix Diesel HX7:

  1. Works harder to protect than conventional mineral oils by continuously preventing soot deposits from building up on engine surfaces.
  2. Up to 19% more protection than other synthetic-technology leading brands tested.
  3. Greater fuel efficiency.
  4. Maintains viscosity and stays in grade throughout the oil-change interval.
  5. Reduces oil volatility and therefore oil consumption and the need for top-up.
  6. Smoother, quieter drive.

Specifications and approvals

Because lubricants vary in quality, universal criteria are used to describe oil performance and usage. Shell Helix motor oils not only meet these increasingly demanding international specifications but usually surpass them. Shell Helix Diesel HX7 exceeds these specifications:

  • API CF
  • ACEA A3/B3/B4
  • MB approval 229.1
  • VW 505 00
  • PSA D level III

Compared with a normal mineral oil (API SG/CD)