Re: out drive
Just purchased a 89 Donzi with a 2010 502. The big service manual that came with boat said 40 weight straight or 25 40
Follow Merc's recommendations on oil.
With this new engine, I couldn't agree more.
Since your new engine has emission control technology it's very important that you use something like MerCruisers
Full‑Synthetic, 20W‑40 oil, NMMA FC‑W rated.
Newly introduced engine packages with Emissions Control have catalysts that will be
rendered ineffective if they become contaminated with certain elements or compounds.
These packages require special lubricants as described in this bulletin.
IMPORTANT: Lubrication requirements for catalyzed engines differ from the requirements
for non‑catalyzed engines. Some marine‑grade lubricants contain high levels of
phosphorus, which can damage the catalyst system on MerCruiser engines. Although
these high‑phosphorus lubricants may allow acceptable engine performance, exposure
over time will damage the catalyst. Catalysts damaged by lubricants containing high levels
of phosphorus may not be covered by the MerCruiser Limited Warranty.
If Mercury MerCruiser Full‑Synthetic, 20W‑40 oil is unavailable, use the following
lubricants, listed in order of recommendation. If you are servicing a catalyst engine, use
these for short periods of time only.
1. Mercury/Quicksilver 25W‑40 Synthetic Blend, NMMA FC‑W?rated 4‑cycle MerCruiser
oil
2. Mercury/Quicksilver 25W‑40, NMMA FC‑W?rated 4‑cycle MerCruiser oil
3. Other recognized brands of NMMA FC‑W?rated 4‑cycle oils
4. A good‑grade, straight‑weight detergent automotive oil according to the last row of the
operating chart below.
NOTE: We do not recommend non‑detergent oils, multi‑viscosity oils (other than as
specified), non FC‑W?rated synthetic oils, low‑quality oils, or oils that contain solid additives.
Preventing Contamination of the Emissions Control System
Catalyst and oxygen sensors can become contaminated, leading to component failure.
Phosphorus, found in some marine‑grade oils, and other compounds will damage or
destroy a catalyst's ability to clean the exhaust. Catalyst‑friendly oil, like Mercury Full
Synthetic MerCruiser Engine Oil, prevents this damage. Approved synthetic oils must be
used in MerCruiser engines with emissions control.
Acetoxy silicone sealants and other compounds in the exhaust stream can damage oxygen
sensors and catalysts. Do not use non‑approved compounds and sealants. Oxime silicone
sealants and Loctite 587 High Performance Blue can be safely used with catalyzed
engines.
Fiberglass, a silica‑based material, can contaminate the catalyst and the oxygen sensors.
To reduce the possibility that the engine will ingest harmful fiberglass and thereby poison
the emission control components, protect the engine from fiberglass dust and debris during
construction and clean‑up.
