25W-40 Outboard Engine Oil, 4 liter | Sierra 18-9440-3 Fuel 1L RA097007

1L RA097007

you also reduce carbon buildup in the cylinders

but they add a little extra performance boost from the inclusion of a Piranha Hydrofoil Stabilizer

Mercruiser GM V6 Exhaust Manifold | Barr Marine MC-1-99746

GR-TOP/CLR

25W-40 Outboard Engine Oil, 4 liter | Sierra 18-9440-3 Fuel 1L RA09700725W 40 Outboard Engine Oil, 4 liter Sierra 18 9440 3 25W 40 Outboard Engine Oil, 4 liter Sierra 18 9440 3 Sierra's Synthetic Blend oil formulated for the stress endured by outboard engines. Sierra synthetic blend outboard engine oil SAE 25W 40 4 liter jug 4 stroke oil is a blend of premium grade synthetic and mineral based stock with highly refined additives Developed specifically for the marine environment and the high running stresses marine engines