benjen, just so you are in the loop on synthetics, Group III synthetics are pumped out of the ground, they are petroleum oils, they are not made in a lab like Group IV or Group V.

Ken

MMMMMMMMM. I think I disagree with that. I believe that synthetic oil, at least 100% synthetic, is made from a base oil with an add package of many different chemicals. The base oil is actually a derivitive of natural gas. I certainly don't know how you get from natural gas to a base oil, but they do. There are of course several grades of this base oil.

Panther.. you don`t have sales tax where you live?

I posted in general discussion "what oil does Mercury recommend for their 1350" I guess all they run is Mercury 25-40 blend. I used to use Mobil 1 20-50 (never had a lubrication problem) when availability went away I switched to Brad Penn. But I think I'm seeing a drop in oil pressure when hot that I never had before?
If Mercury 25-40 is good enough for their 1350 should be fine for my 1150's??

Close,
It is more than an additive package that makes petroleum based oil a synthetic, it is the refinement process. Refining ground based oil multiple times removes the impurities and creates more uniform molecules.

Yes, I do understand that. I was just trying to generalize my reply of the oil was not crude oil pumped out of the ground. That 100% synthetic oil was not just a little fairy dust added to the same stuff that has been on the market for generations.

http://www.synthetic-oil-technology.info/

One of these??

http://www.mercurymarine.com/parts-a...nd-mercruiser/

or

http://www.mercurymarine.com/parts-a.../blend-verado/

seeing that you think "reading says it all" Why don't you read some more?

The troubling thing in your information, is the statement that synthetic oil does not come from the ground. The majority of synthetic oils are a refine product that comes from the ground.

One of the most popular synthetic oils comes from the ground, as do most oils that you buy off the shelf http://www.mobiloil.com/USA-English/...Motor_Oil.aspx

First of all I never said that it comes from the ground any where in this thread.

I also know that A TRUE full synthetic oil is not made from a crude oil distilling process or refinining prosess. I have spoken with a AMSoil factory rep when he came out to showcase the new Dominator oil I use in my race sleds. I have personnaly tested the flash point of three samples of oil from other vendors right out of the bottle. Pensoil racing, Castrol and Klotz racing oil for two stroke engines. The test is simple, put the oil on the stainless steel plate and put a torch under it. Anyone who knows oil that a crude based oil with burn and eventually ignite. Guess what Pensoil , Castrol and Klotz did start burning somewhat quicky. The Amsoil lasted almost twice as long. All oil is engineered!! They all add the anti wear and detergent additives to it. Synthetics use a base compound. Some oil companies use crude oil mix with their Synthetic bases and compounds, that are refined into this "Semi Synthetic oil". That is why it is called a semi synthetic. Such as Brad Penn Grade 1 oil.

With EGT temps hitting around 1300 f in my sled I need a oil that is the absolute best out there for it. Amsoil is it.. Period. In my boat I use Brad Penn because it has proven by racing engine shops. Engine builders for Dirt Track, Circle Track and drag racing engines, use it, and some use it for multiple races too. Its a semi synthetic but it flat out works. Dirt track and circle track and drag racing are not easy on engines.

I know my oils that I use in my engines and how they will perform. And the UOA from the lab backs up what I already knew from the start, and how it ran in my engines from the last oil change. You need to run a oil that works for you and your budget. Then get it tested after you have run for a while under your typical driving conditions that you will normally subject your boat to, after a regular oil change interval get what ever oil you are using tested. Only the UOA test will show if you oil is working well for your engine and how much life" protection additives " were still left in the oil when you changed it.

Just saying you have to read between the lines.