Extended Drain Intervals

A regional delivery fleet aimed to reduce downtime by extending engine oil drain intervals across its vans. The vehicles covered high motorway mileage and were serviced frequently, creating pressure to reduce maintenance time without affecting reliability.

The challenge was extending oil change intervals without increasing engine wear or risking manufacturer compliance.

The original approach

The fleet followed standard mileage based oil changes using a general purpose engine oil. While servicing was regular, vehicles spent significant time off the road purely for oil changes.

Management questioned whether the oil in use was suitable for longer service intervals given the operating conditions.

Reviewing oil capability

Vehicle manufacturer specifications were reviewed alongside the performance limits of the existing engine oil. While the oil met basic requirements, it was not designed for extended drain intervals under sustained high mileage use.

An oil with higher oxidation resistance and stronger additive performance was identified, while still meeting all required approvals.

Changing the lubricant

The fleet switched to an engine oil specifically designed for extended service intervals in commercial vehicles. No changes were made to servicing procedures other than oil selection and monitoring.

Oil condition was checked more closely during the initial transition period to confirm performance.

The outcome

Oil changes were safely extended without negative impact on engine condition. Vehicles spent less time off the road, and maintenance planning became more flexible.

Fuel efficiency and engine performance remained consistent across the fleet.

Key takeaway

Extended drain intervals are possible when the correct engine oil is used. Success depends on matching oil capability to vehicle usage and manufacturer requirements, not simply extending intervals to save time.