https://www.walshlubricants.ie/product/castrol-st-90-monograde-gl3/
ST 90 Monograde GL3 - Walsh Lubricants
Sep 12, 2026 - Castrol ST 90 Monograde GL3 is suitable for the lubrication of most types of gears including helical, spur, bevel and worm; but not for hypoid gears.
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