Looks like you need to add the engineering staff of Mercruiser to the list of idiots that you need to
straighten out. Good thing Yamaha and OMC are out of the stern drive business or you would, no doubt,
have to educate and enlighten them out too!

Gene Kearns wrote:

On Fri, 19 Dec 2003 23:16:31 GMT, WaIIy
wrote:

On Fri, 19 Dec 2003 16:21:01 -0500, Gene Kearns
wrote:

Yeah, there verbiage is:

"Synthetic engine oils are not recommended for use
in Crusader Engines. Synthetics may offer advantages
in cold temperature pumpability and high temperature
oxidation-resistance. However, synthetic oils have not
proven to provide operational or economic benefits over
conventional petroleum-based oils in Crusader Engines.
Their use does not permit the extension of oil change
intervals."


My issue with them is, "in a perfect world - not too hot, not too cold
synthetics just aren't necessary in our engines." Well, duh! I plan
for Murphy's Law, not Pollyanna's law of engine dynamics.... and at
the acquisition and repair costs of these engines, everyone would be
well advised to do likewise..

Oil is a helluva lot cheaper than repair and replacement.

Mercury chimes in...

MPORTANT: The use of non-detergent oils, multi-viscosity oils (other
than Quicksilver 25W-40 or a good quality 20W-40 or 20W-50), synthetic
oils, low quality oils or oils that contain solid additives are
specifically NOT recommended.
http://www.mercurymarine.com/fueloil...mendation_faqs

If you read what they have written.... they don't recommend using
*any* type of oil but a straight weight, detergent dino oil. What is
so special (and different) about their engines?

I don't understand any more about the *why* for this "recommendation"
than I understand the *why* for them calling their Quicksilver 25W-40
a multiviscosity oil... when you get past their mumblespeak that
Skipper used to post every 3 months it is obviously a single viscosity
oil.

In fact, for the first time, it appears they have slipped up and
admitted as much: "...25W-40 Marine Engine Oil. This oil is a special
blend of 25-weight and 40-weight oils..."

--

Grady-White Gulfstream, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillage.com/directions.asp Where Southport,NC is located.
http://www.southharbourvillage.com/autoupdater.htm Real Time Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats at Lee Yeaton's Bayguide