H Ken..you are right on the new Mobil-1 site the cst @100*C is 17.7. M-1 15W-50 is 18.

I think some reformultaing has been done. Too bad.

That's why bike racers are moving on to Motul 15W-50 as they say M-1 V-Twin is shearing in endurance racing.

Some are also going to Amsoil 20W-50 V-Twin which has a cst of 20 @100*C.

Redline 20W-50 or 15W-50 is a great choice too.

Noting stays the same forever I guess...

I've been using synthetic in my 525 but it seems to be burning through a lot of oil...any idea what would be causing that?

I run it hard in spurts, but I'm not sitting on it at WOT all the time.

First things first, what are you using? How much are you burning, how often?

Using Mobil 1 Synthetic 15W 50. I went through 2+ qrts in about 20 hrs

Try Amsoil V-Twin 20W-50 I think your consumption will go down. It has a tendency to seal around pistons very well.

http://www.amsoil.com/storefront/mcv.aspx

I went that route myself on my other boat.
It will help somewhat with consumption.
My big blocks have always had this thing where you check oil level even after blasting and things are OK.
Then a fews days later it will have taken a drink.
Nature of the beast.......:cool-smiley-011:
d

Yea, I think Bob likes Amsoil. :D

He uses the new 15w-50 Dominator Racing Oil and the SVT 75w-110 Gear Lube

:D
He does now........:drink:
Damn I could use a free T-shirt

Amsoil is making it's way to the very top of synthetics..they are taking things very seriously.

They have an outstanding line. I would use any of their products with confidence.

I've used Amsoil products in the past with great results. Stopped using it simply because of their "Amway" sales technique. I want to be able to go down to O'Reilly's and pick it up, not have to pay for a preferred membership and buy it in huge quantities as not to get reamed on S/H.

So..................if we had to pick

Mobil V Twin

or

Amsoil Vtwin

557's, dry sump, Big Chief heads, 1471's, 6800 redline

So i shouldn't be concerned? Just gets me a little concerned when I'm putting in almost 3 qrts of oil every 20 hrs....

If It were my situation I would be checking plugs,compression/leakdown,etc.
Maybe a bad valvestem seal if your lucky.
I don't know how hard you run the boat but 3qts. seems like a lot of oil in 20hrs.
I had an engine doing that and had cracked rings.
I kept up on adding oil for the season.
Try not to let it ruin your season and then get into the engine in the offtime.
d

My call is even between those two. The Harley guys like Eagle and Amsoil and then M-1 I hear..



Now if you are asking about Motul 20W-50 Non-PAO totally synthetic Racing Oil @$31.80/ 1.2Litres...I'd go with Motul. It's a professional racing oil. It may be the one to beat. A very stout product.

http://www.motorspotstore.com/moraoi.html

Thanks, don't think it is a ring as they were just replaced and had good compression on it 25 hrs ago (had a compression test done). Might have my mechanic run leakdown test to be on the safe side....all my other vitals look good though.

Thanks! :drink:

Thank you sir.... I have used Vtwin in the past in my Spectre and it cooled my oil temps down.

I'm not to thrilled with the Brad Penn in my Skater...

Brad Penn is a pensylvania derived product that is a parafinnic oil.

Penn makes all the 30wt oil for Briggs and Startton lawn mowers. ZDDP is 1400-1500 ppm.

It's a green colored oil. They make a racing and V-Twin oil.

When you see those decreased temps With M-1 V-Twin on the gauges it means the engines are working a lot less harder and the wear will be decreased.



M-1 V-twin is a really an outstanding product.