[C320-list] Engine Oil

[Jeff Hare]

It is recommended to change the oil at the end of every season for those wintering not because the oil is dirty or broken down but because of the moisture and acid that builds up in it from the fuel. The sulfuric acid can pit engine parts. Sailboat engines are at risk because of the low % of hours the engine runs while at operating temp. Long runs at temp are necessary to remove the moisture from the oil. 

So, I'd check with yanmar or an oil analysis co to see whether its really ok to use the filter only change regime in your situation.

My $.02
Jeff

Rick Sulewski <rsulewski at bex.net> wrote:

Don,

I have been using Mobil 1 10W-30 for 16 seasons and that amounts to 1,100
engine hours. I contacted Westerbeke USA and spoke to a technician who
indicated no problems because Mobil 1 exceeds the warranty requirements.

If synthetic oil is good enough to be recommended by GM for my Vette, it
should be good enough for my 320! I am considering moving to Mobil 1
extended service next year and that may permit me to just replace the oil
filter after one season and move toward replacing the oil every other year
since so few engine hours are actually logged each season.

Rick
My-Ria #277

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Donald Lawson
Sent: Thursday, October 20, 2011 9:00 PM
To: c320-List at Catalina320.com
Subject: [C320-list] Engine Oil

Have a friend in the club who has a DEERFOOT 62. Has completed an around the
world cruise over 3 years plus a Med cruise. He as a big turbo'd Yanmar
diesel that has 6000+ hours on it. He uses 15-40 Mobil 1 synthetic oil. 
Any one have a reason why a synthetic oil can or can not be used? I
normally use Delo 400.
Don Lawson #1005