PSLONAKER,you are needed on the cardshark thread,no one wants to hear your BS over here.

Salt water and oil always makes a mess, regardless if the oil is syn or dino.

Lucas makes a Zinc-heavy "break in additive".
It's something on the order of 36,000ppm of Zinc (and high phosphorus as well).

They can't market it as a "regular" oil additive because it would then be required to NOT alter the oil chemistry outside of the SM/SN specification (somebody quoted a Merc manual stating somethign about SH oils - man, don't I WISH we could still get SH oils.....).

Doing the math and testing it myself, you can add 1 ounce of the Lucas Break In Additive w/Zinc to a quart of SM oil and end up at 1600ppm zinc. For lawn mower engines (flat tappet beasties that they are), I doctor up every quart I use.

For cars and boats with roller lifters? No need for the extra zinc unless you are running something that's severely overstressed.

With that said, synthetic is a superior lubricant under a wider range of temperatures.
MC

So how many Mercury oils are there?

Is it true there are three?
1 Original 25W-40
2 Blended semi synthethic 25W-40
3 Full synthetic 20W-40

Which one would be the best for 500/525 engines? I heard their most recent full synthetic product actually has less of the formerly used antiwear additives because it could hurt catalytic converters. Well, I don't have cats and want the best oil! What about AMSoil Dominator 15W-50?

Thanks, Andy

Take a look at this video. This is what happens if you have a screw up and get water in the oil. It is nothing like dino oil and this crap that I am draining out IS Mercury synthic oil. Are you SURE you want to go there???


http://www.youtube.com/watch?v=xZxC7...5&feature=plcp

Those are the only 3 I know of from Merc. Funny the manual for my 525 only recommends the orginal 25w-40 stuff. I wonder why the wouldn't recommend their syn. stuff?

you cannot use synthetic oil in any marine engine,the rollers on the lifters will slide into infinity,the pistons wont have enough drag,the bearings wont have enough friction,the harmonic balancer wont sing the right tune,the spark plugs will turn pink,and the exhaust will smell like sulpher,never attempt to use it in any marine engine,period.

:lolhit: :drink:

Sorry Dude, but I know if you chose to ignore the people on this forum (Ray) that make a living and stake their reputation on what they know and sell that is your prerogative. There is a reason that Chevrolet chose to put synthetics in the Corvette many many years ago. It is a know fact that synthetics perform BETTER than conventional oils in ALL categories.

Mobil 1 15w-50 has 1300 ppm of zinc in it and that is what I run in my 1980 twin turboed BBC

http://www.mobiloil.com/USA-English/...duct_Guide.pdf