Deutz issues their own set of requirements for service fill engine lubricants used in their engines. These are periodically updated, either when testing requirements are changed or new specifications are added.

Each individual specification is known by its DQC (Deutz Quality Class) Number. The Deutz DQC numbers begin with roman numeral, followed by the version number e.g. “Deutz DQC III-18”.

The roman numeral is one way to differentiate the DQC specifications, as described by Deutz:

  • III-18 / III-18LA – Standard Quality
  • IV-18 / IV-18LA – Ultra High Performance

If the Deutz DQC version number is followed by “LA” this indicates that the approved lubricant contains lower levels of Sulphated Ash, Phosphorus and Sulfur (SAPS). Lubricants with these approvals are designed for use with Deutz engines fitted with advanced after-treatment devices such as Diesel Particulate Filters (DPFs).

The specifications detail allowable viscosity grades, ACEA or API level performance that must also be met plus additional physical, chemical and engine testing that must be conducted.

Deutz allows the use of standard ACEA/API/JASO fluids as alternatives to some of their specifications (DQC I, II & II LA).

Always follow the handbook recommendation.

For more information see the Deutz overview page: DEUTZ AG: DEUTZ Quality Class

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