HGV oil seals: compound selection and fitment
An oil seal performs one function: it holds lubricant inside a rotating assembly and keeps contaminants out. When an oil seal fails, the consequences range from gradual lubricant loss to accelerated bearing wear from ingressed water, grit, and road contamination. On commercial vehicles covering high annual mileage, seal integrity is a maintenance item that affects drivetrain longevity directly.
The EBS EKOS range from Serenco UK covers the main rubber compounds used in commercial vehicle oil seals. EKOS.9 uses an FPM (fluoroelastomer) compound — the correct choice for high-temperature applications, fuel-contact seals, and aggressive oil additives. EKOS.57 uses NBR (nitrile butadiene rubber) for standard mineral oil applications. EKOS.48 uses ACM (polyacrylate rubber) for automatic transmission and high-temperature gearbox seals. EKOS.75 uses silicone for extreme temperature ranges.
DT Spare Parts oil seals cover OEM-equivalent fitment for the main commercial vehicle makes. Correct sizing requires three dimensions: the inner diameter (shaft diameter), the outer diameter (housing bore), and the width.
For compound selection advice or to confirm fitment, call us on 01527 68279 or contact our team at https://truckstopgroup.co.uk/pages/contact.
Frequently asked questions
What is the difference between NBR and FPM oil seals?
NBR (nitrile) is the standard compound for mineral oil applications. FPM (fluoroelastomer/Viton) is used where temperatures exceed 120 degrees Celsius, where synthetic or ester-based lubricants are used, or where oil additive chemistry would degrade an NBR seal.
How do I size an oil seal correctly?
Three dimensions are required: inner diameter (equals the shaft diameter), outer diameter (equals the housing bore), and width. Measure the existing seal or the shaft and housing directly. An undersized inner diameter will leak; an oversized outer diameter will not seat correctly.
Are universal oil seals suitable for HGV use?
Universal seals are suitable where the dimensions match exactly. For critical drivetrain applications — wheel hub seals, crankshaft seals, and differential seals — use an OEM-specified seal where one is available, as these are manufactured to tighter dimensional tolerances.
What causes premature oil seal failure?
Shaft surface damage (scoring or corrosion at the seal contact zone), incorrect compound for the lubricant or temperature, misaligned installation, and running the seal dry during initial start-up are the main causes of premature failure.
Do you sell oil seals near me?
Truckstop Group delivers oil seals to all UK mainland addresses. Next-day delivery is available on stocked lines. Same-day collection is available from our branches in Redditch, Worcester, Birmingham, and Evesham.
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