http://www.mobiloil.com/USA-English/...1_15W-50_.aspx

they call it: Mobil 1 15w -50....
so how do you want me to call it?

I post the wrong number though. it is not 20W -50 its 15W -50 but i did post it. the 20W-50 is for bikes....

 

I may have missed it if you posted that, sorry....

But that is one of the things I am getting at... Most people have little to no idea what the viscosity numbers represent, much less the ratings ie: SJ/SL/SM....

And then companies like Mobil throw out "Mobil 1".. That is a Brand, just as AMSOIL is a Brand, or Motul or the rest...

First off, unless you are running a loose clearance engine, it is tired or worn out, or goes on the track for hours at a time, a 50 weight is too high a Viscosity oil even if it is a Petroleum Product.

Let's visit something that I get emails, PM's and phone calls about on a daily Basis, and that is, what do the numbers represent on the bottle..

Let's use your example of 15W-50.... Oh... the W is important as a 15-50 would be a different animal

The first number, 15 in this case, is the Viscosity of the oil at 0 Degrees Cent. (32 F) and is measured basically with a steel ball in a cup of oil with a magnetic wand rotating below it. Revolutions counted.. blah, blah, blah...

The W... Important here... Many people think it stands for "Weight" and it does not. It stands for "Winter"... 15 Winter Viscosity...

The Second number (On the Right) is the Viscosity of the oil @ 100 Degrees Cent. (212 F) and is measured through a drip type system.

Now, we get to where people "think" that a heavier oil provides better protection. Not true in the case of these tight clearanced Power Houses in most applications of what we see here on EVOm.

It costs HP and/or Fuel Mileage to use a heavier Viscosity oil than needed. That little oil pump has to push the heavier oil through clearances that were designed by the OEM to flow a lighter weight oil. Think of it just like the difference of sucking water through a straw or sucking a nice thick shake through the same straw..

Too High Viscosity oil will also increase oil temps due to the friction created.

If you are running a basically stock clearanced bottom end, and don't run for longer than right around 30 minutes on the track, there is not only no benefit to running a High Visc oil but it is actually detrimental...

The engine builder for our 1400 HP 2.3 EcoTec said we HAD to run 20W-50.. After looking at the build, the choice was made to run AMSOIL AMO 10W-40. This vehicle was designed, built and run at the Bonneville Salt Flats. The first engine expired right on the Dyno.... Blew the head right off the top... The second engine dyno'd at 1400 HP and there is more left... He couldn't believe that there were no problems running the 10W-40... But.... AMSOIL doesn't "thin out" like most oils and all petroleum oils will.

Robevo..... It sounds like you need to downgrade your oil.... You, as well as many others, are mixing old thought and oil practices with new engineering for both Engines and oils....

Doc

 

^+1

 

compared to the factory oil, i did run last summer with this 15W-50 oil around 20 -30 Fahrenheit cooler. According to my Defi .
But i never used the 10W-40. we used to run thick oil when we race. but i skipped 8 years of racing and that is a lot.
So i listen and i will try the next track day the 10W-40. sadly i have a new car so i cant compare to the old one.
But still is a good info, i will try it.
Thanks.

 

So you can run 15w-50 without any issues?

i wish we had one cosolidated oil page... each thread says something totally different

Can someone answer this... what oil is best for:

Car with stroker and GT35 on track days?

Car with stroker and GT35 for street driving?

thanks

 

"Best Oil" can be somewhat subjective person by person. I prefer to look at tests and actual results in a somewhat coontrolled but severe environment such as racing.

As to your question by application, if you know how your bottom end was set up, it would help. In other words, tight, loose or really loose. It seems as though the tendency is to kep the bottom ends fairly tight (stock) clearanced so the use of a lighter viscosity oil is acceptable.

Not only is it acceptable but preferred in todays race engines unless long distance endurance racing such as NASCAR, or Offshore Boat Racing...

On August 1st, AMSOIL is introducing 3 new Racing Oils, 15W-50, 10W-30 and 5W-20... Yes, 5W-20.

Either the 10W-30 or the 5W-20 will be the oil of choice for the EVO.

Ue of a 50 weight oil will only be needed if the car is used as mentioned above for long distance racing or loosened clearances.

With the tight tolerances on the EVO, and the common 20-30 minute track times, the 10W-30 and the 5W-20 Racing oils will give you the ultimate protection and performance including increased HP.

Feel free to email me for information until I get it up on my web site. AMSOIL@bestoil4you.com

Doc

 

the problem is , what ever happen the engine, 99.9% time you can't prove it caused by wrong brand of oil. Fact, i never heard any of those case.
So for me these type of threads / Mobil vs RP vs what ever/ are preatty much " i assume"...

But the weight of the oil can be , for sure. As you mentioned i'm using the old guys system. That is right. But a mean time the mobil oil is advancing too. So if they kept those rates up, i'm sure there is reason for that.
But i will listen, and i'll try to run 40 next time.

Also if you are in NE , and you are running december , below 20 or august in the 100's. then you should use a different weight too.
as i learned.

 

OK... I will try and decode this... You can prove if it was the oil... that is easy... it is called oil analysis..

People are over complicating oil weight choice mostly because they don't understand what the numbers on the label mean...

The number on the left, is the Winter weight. The "W" must be present..... The number on the left is the Viscosity of the oil at 32 Degrees.... The number on the right is measured at 212 Degrees.. Operating temp... So theoretically, if you could have an oil with a Viscosity of 5W-100, it is approximately the same as 5W-20 at Start-up...

Everyone is using "Old School" thought processes for Petroleum oils in a vehicle that requires synthetic just for starters..

Things are changing in the world and oil is one of the big ones... The EVO and most other cars today have tighter tolerances than other vehicles in the past which is why many of them called for 40 and 50 weight oils...

The trend towards tight tolerance engines and lighter viscosity oils will continue forward. There are some vehicles already out there that REQUIRE an oil no heavier than a 20 weight or they will not run properly.

Change your thinking... The other oils are always playing catch up to AMSOIL.

Doc

 

Always great when the DOC gets involved

 

i love it too. one way to learn for sure.
wich engine requiers no more the 20? that engine is pretty tight i assume.

 

Actually there are a few where it is Required and more and more are recommending it..

The one that comes to mind because I have sold several of them is the Dodge Truck with a Hemi. The 20 weight is required due to the engine management system where it shuts off cylinders under cruise. This is a Heavy Duty V-8 and calling for a 20 weight. I am looking forward to seeing some of the people here use the new 5W-20 Racing oil or even the 10W-30, but the 5W-30 should show some good performance gains.

I hope eveyone understands when I make a post, that I am trying to give information and stop mis-information that has accrued over the years and I am not trying to be a jerk in any way.

I am a very blunt person and sometimes the way I say things, may hurt some peoples feelings.. I just put it out there, so don't take anything personal...

I will say, that the majority of the people on this site, are very open to new ideas that come around and resposive to me as well. Maybe because it is a younger crowd and their minds are more open to change in this ever changing world. I appreciate that and I will never knowingly lie or mislead anyone.

Doc

 

i sound jerk many times too, just because i questioned people opinion.
i got to ask again, the 2.0l turbo charged evo engine we talk about here , then how we ending up with the hemi v8 engine oil comparison? that can be misleading too.
just because the new v8 truck engine running on 20? that is proving for me nothing .
the high heat and revving engine, as we all know is totally different from the low rpm n/a truck engine. Also the 5W-30 is a factory recommend oil, and they not selling cars for race track.

i'm kinda confused about this oil thread going though.
for racing purposes we should running on what? /no brand name pls/
or DD? how about winter vs hot summer?
that should summit up for me
thanks Rob

 

Understood..... The comparison for the V-8 was just what I knew off the top of my head... The Trend will continue to lighter weight oils. Usually these powerful little 4's run very tight tolerances and will benefit from these ne light weight oils that are being driven to be developed for fuel mileage.

The use of 10W-30 and now 5W-30 oils were used in the Turbo cars as it was easy to formulate for the Turbo and the closer the spread between the numbers were, the more shear stable the oil..

Will have to come back to this... phone call

 

royal purple 5w-30 it sick

 

Mobil 1 Ftw!!!