Heavy Duty Diesel Fleets Technical Transition Guide

This document provides the technical guidance required for the use of Sinopec T700 15W40 and Sinopec T700 10W30 in heavy-duty diesel engines.

Equipment covered

  • Commercial trucks and transport fleets
  • Construction and off-road diesel equipment
  • Municipal and mixed fleets

Key risks addressed

  • Aftertreatment compatibility
  • Wear protection under high load
  • Oil consumption and viscosity stability

Technical basis for use

Sinopec T700 oils are positioned to ACEA E9 and API CK-4, which are specified for modern diesel engines fitted with EGR, SCR and DPF systems.

Grade selection

Operating condition Grade Rationale
General fleet operation T700 15W40 Proven viscosity stability across wide temperature ranges
Fuel efficiency or cold start focus T700 10W30 Lower viscosity supports reduced internal drag

Equivalency statement

Sinopec T700 15W40 and 10W30 are suitable for use where ACEA E9 or API CK-4 engine oils are specified, subject to OEM viscosity requirements.

Changeover guidance

  • Changeover at scheduled oil change
  • No flushing required when replacing oils of the same category

Glossary and reference

Definitions and reference material used across lubricant documentation, including abbreviations, standards terminology, test method references, and classification systems. These pages support consistent interpretation of specifications and data sheets.

Technical Transition Guides

Equipment and industry focused technical summaries covering common operating conditions, lubricant functions, and specification considerations used when reviewing or comparing existing lubricants.

Last reviewed: January 2026