Of course you can. You can mix a PAO 6 with a PAO 8 to shoot for a particular viscosity for a given application. You can even add more than 2 PAO base stocks together.
Just because is a PAO doesn't mean the viscosity was proper for the application. PAO'S, like petroleum base stock can be blended for an application. Ken

That's true in that Redline does this very thing you describe....arriving at a GRP V + formula base.


So so you think M-1 15W-50 then is 100% PAO by their e-mail reply?

I would be very shocked and surprised that a leader in the synthetic lubricant field, who took Castrol to court on this very subject (they did loose however) would lower their standards to become an also ran. The synthetic world wouldn't be where it is today if it wasn't for Mobil.
Why they worded their e-mail the way they does open the door to dialouge. Whoever recieved that e-mail should e-mail them again and ask...what do they mean by 100% synthetic oil? All PAO or a blend of Group III and PAO. I would think they would answer all PAO.
Ken

When ExxonMobil gives me anythying, I will let you know.

My suggestion is to have Mobil label their product as being a PAO to differentiate it from a GRP III product ...assuming it is a PAO.

My .02

I have tried every synthetic oil out there. Some of them I like and some I just don't as I can feel how the engine runs and track mileage as well. I have seen engines torn down with 600 hard hours that have bearings that look like new with V-Twin being in the crankcase. Having said that....M-1 15W-50 and 20W-50 V-Twin have always performed very well for me.

While I see postings on oil threads suggesting Mobil has reformulated "downwards" I personally can not see a performance difference.

I would like to know what I am buying, however and content labeling would make me very happy.

It's going to be hard to get any major to do that. I don't think it has gone downward, but I am biased in my opinion. I can let you know what they are touting.

"New Mobil 1 15w50 is special high viscosity formulation with extra anti-wear additive, designed to deliver extra protection for severe service such as towing, hauling and racing. Mobil 1 15w50 is recommended for turbocharged, superchared and other high performance engines."

It will be available beginning February 5, 2007 througout the ExxonMobil distributor network.

PDS and MSDS and Full Disclosure MSDS are not available yet. You will see though the oil 15w50 MSDS...

The added anti-wear ingredients are welcome.

A bunch of PM's asking why Mobil is reformulating 15W-50.

This might shead some light on their decision.

http://theoildrop.server101.com/foru...rue#Post803907

A few PM's came in about if Amsoil is all PAO or not.

A general statement that can be made is that any $9/qt synthetic oil remains a 100% PAO synthetic.

That is most likely true for Amsoil as well.


The M-1 V-Twin 10W-40 and 20W-50 are certainly so.

Amsoil 20W-50 Severe Service Racing is a PAO.

All Redline products are definately GRP V Paos.

RP $9/qt oil is and the $6/qt might be..not sure.


Lots of good choices. We heard that 15W-50 M-1 is being reformulated as we speak and will be released in a new packaging as well. So we await to see what this "improved formulation" will hold for us.

See ya!

Who makes Mercury 25W-40 oil?

It is made for Mercury by Citgo and that is confirmed by Citgo and Merc.

It is a "parafinic" oil simliiar to some of the bases Penzoil Racing has used in the past. The flashpoint is 500*F which is excellent and what one would come to expect from a heavy "parafinic" type oil.

What does all that mean?

Well Mercury set out to have an oil blended that is extremely resistant to shear forces and apparently succeded at doing just that. It is a "heavy oil" and my best guess is probably one of the best oils of it's particular type that you can get.

I would have no problem using this oil but would of course make a mental note that 25 hour drains are prudent. Maybe even an "every other oilchange engine crankcase" flush with "Gunk".

Why?

There is one "downside" to heavy parafinic based oils and that is they generally have a tendency to sludge up an engine if pushed beyond their limits. The parafin which is a wax can proceed toward it's natural tendency as it breaks down to form carbon and in combination with a waxy matrix you get sludge and later even still "coking".

I would imagine there are stabilizers to help reduce this from happening but none the less these types of oils have been reported to on occasion lead to sticky valves etc. if not changed frequently enough to a greter extent compared to parafin free products.



Here are the specs it is made to:

http://www.mercurymarine.com/uploads...1/003-1647.pdf