Oils, Fluids and Sealer› Oils, Fluids and Additives

SIERRAMARINE

CATALYST OIL 25W40 55 GALLON

$1,904.23

SKU: S08C 18-9400CAT-7

In Stock
In Stock
Ships by Jun 8
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

Sierra 25W-40 4-Stroke Marine Engine Oil is engineered to provide superior protection for a wide range of gasoline inboard and sterndrive engines. This conventional marine engine oil is formulated to reduce wear on internal engine components, offering excellent lubrication and extending engine life in harsh marine environments.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandSIERRAMARINE
Part NumberS08C 18-9400CAT-7

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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