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A. Castrol Transmax Axle EPX 80W-90 is a multipurpose axle oil for use in differentials, final drives and other applications requiring an extreme-pressure gear oil to API GL-5 specification — passenger car, light commercial vehicle and commercial vehicle axles.
A. API and ACEA are the universal lubricant performance standards every reputable oil meets. They are your baseline check — match the code your handbook specifies (e.g., API CI-4 or ACEA E7 for heavy-duty diesel) and the oil is technically suitable for your machine. Every oil on our site lists its API and ACEA classifications.
A. Castrol Transmax Axle EPX 80W-90 meets API GL-5.
A. An OEM Specification is the lubricant requirement set by a vehicle or equipment manufacturer (e.g., MB 228.3, VW 504.00). When an oil lists the code, the oil manufacturer has developed and tested it to meet the criteria the equipment manufacturer requires. Match the code in your handbook and you have a lubricant engineered for your machine.
A. An OEM Approval means the oil has been formally tested and signed off by the equipment manufacturer and listed on their official approved-products register (e.g., MB-Approval 228.3). An Approval confirms the oil is recognised by the equipment manufacturer for service use in their machines.
A. Castrol Transmax Axle EPX 80W-90 carries MAN M342 M; and ZF TE-ML 05A.
A. No — for limited-slip differentials, use Castrol Transmax Limited Slip Z 85W-90, which contains the friction modifiers required for LSD service. Standard API GL-5 axle oil such as the EPX range typically causes clutch chatter in an LSD.
A. API GL-4 is the performance category for manual transmission gear oils. API GL-5 (this product) is the higher-extreme-pressure category for hypoid axles and final drives subject to higher shock loading. The two categories are not interchangeable.
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