10W-30 4 cycle oil is a highly refined petroleum product formulated with premium base stock and highly refined additives. Specifically formulated to meet or exceed the tough requirements of the Marine 4-Stroke motor manufacturers, Mercury, Yamaha, Johnson-Evinrude, Suzuki and Honda.
- Excellent anti-wear characteristics
- Reduces friction
- Formulated to offer maximum corrosion
protection - Reduces sludge keeps engine cleaner for
better efficiency - Low temperature viscosity offers better cold starting
- Meets and exceeds quality performance API SJ, CF-2, CH-4
- Guaranteed and backed by our famous Sierra comprehensive warranty. (Will not void your engine manufacturer’s warranty)
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Engine & Drive Parts
Paint , Dinghies , Kayaks & Engines cannot be shipped outside of Ireland & UK mainland.


