Oil and Maintenance Guide for 1981 Mercury XD (2-cyl. 400cc 2-stroke)
Before You Service the Engine
For the 1981 Mercury XD (2-cyl. 400cc 2-stroke), identify the correct two-stroke lubricant and confirm how the engine receives its oil. A catalog oil listing does not establish a fuel-to-oil mixing ratio or confirm whether the machine uses oil injection.
What type of oil does a 1981 Mercury XD (2-cyl. 400cc 2-stroke) take?
The available oil-product listings include HP Marine Synthetic 2-Stroke Oil, Synthetic 2-Stroke Injector Oil. For a service, choose oil that meets the engine’s actual application requirements, not just a product name.
Does a two-stroke MARINE OUTBOARD always require fuel premixing?
No. Two-stroke outboard motor may use premixed fuel or separate oil injection. The product listing does not establish this craft’s oil-delivery design or a safe mixing ratio; consult the correct service manual.
