Unleashedbeast

It doesn't matter if the cars are stock or modified. Mobil 1's 5W-50 API SM/SN formulation isn't going to stack up against a true group IV PAO base stock with API SL/SJ levels of ZDDP. It's not going to happen.

mobydick

Consumer Reports

The surprising Truth about Motor Oils!

ACTUAL TEST not someone “research”

I can’t find the actual Article on Consumer reports but here it is reported on another site!

http://www.xs11.com/xs11-info/articl...july-1996.html

Recommendations
None of the tested oils proved better than the others in our tests. There may be small differences that our tests didn't reveal, but unless you typically drive under more severe conditions than a New York cab does, you won't go wrong if you shop strictly by price or availability. Buy the viscosity grade recommended in your owner's manual, and look for the starburst emblem. Even the expensive synthetics (typically, $3 or $4 a quart) worked no better than conventional motor oils in our taxi tests, but they're worth considering for extreme driving conditions high ambient temperatures and high engine load or very cold temperatures.
On the basis of our test results, we think that the commonly recommended 3,000-mile oil-change interval is conservative. For "normal" service, 7,500-mile intervals (or the recommendation in your owner's manual) should be fine. Change the oil at least that often to protect your engine and maintain your warranty. Even for the severe service experienced by the taxis in our tests a 6,000- mile interval was adequate. But some severe service - frequent cold starts and short trips, dusty conditions, trailer towing - may require a shorter interval. Note, too, that special engines such as diesels and turbos, which we didn't test, may need more frequent oil changes.
We don't recommend stretching the change interval beyond the automaker's recommendations, no matter what oil you use. Engine combustion contaminants could eventually build up and harm engine parts.
As for STP Oil Treatment, STP Engine Treatment, and Slick 50 Engine Treatment, our advice is simple: If you use an oil with the starburst symbol, you don't need them.

zporta

I swear you are like f*cking herpies, you never go away

Unleashedbeast

I knew I shouldn't have had sex with that girl in Vegas.

Now I've got this terrible itch, and the doctor said I have the "Mobies"

6-Speed

Here's why I say M1 5W50 appears to have a very similar make-up as the Motorcraft 5W50 oil, but with much more of the good elements. The comparison data was gathered from VOAs of the two motor oils, with the exception of M1's TBN, which was from its PDS.

Unleashedbeast

It has nice TBN, nice calcium, too bad it still has API SM levels of ZDDP.

The UOA I've seen with it used still shows shearing much like Motorcraft and Castrol, although...it would be better if I could see more than that one UOA.

mobydick

No, it doesn't matter if they are stock or modified as long as they are all the same. You have no clue about actual Research. I thought you should start simple.

Lifter583

I run Schaeffer 9000 Supreme full syn 5/50

SAE Grade 5W-50
Viscosity @ 40°C, Cst (ASTM D-445) 146.87
Specific Gravity (ASTM D-1298) 0.85
Viscosity @ 100°C, Cst (ASTM D-445) 20.24
Viscosity Index (ASTM D-2270) 158
High Temperature/High Shear Viscosity 302°F/150°C,
cP (ASTM D-4683)
5.08
Cold Cranking Viscosity (ASTM D-5293)
@-30°C, cP 6,005
Mini Rotary Viscosity TP-1 @ -35°, cP (ASTM D-4683) 25,000
Flash Point °F/°C (ASTM D-92) 440°/226.67°
Stable Pour Point °F/°C (FTM 7916 Method 203) <-41°/<-42°
Total Base Number (ASTM D-2896) 7.1
Sulfated Ash Content % wt (ASTM D-874) 1.1
Shear Stability (ASTM D-3945 Procedure A)
% Viscosity Loss 14%
Copper Strip Corrosion Test (ASTM D-130) 1a
NOACK Volatility %Evaporation Loss (ASTM D-5800) 8.92%

6-Speed

Mobile 1 specs their 5W50 with 1100 ppm Zinc and 1000 ppm Phosphorous; Blackstone's tests seem to indicate on the low side for these elements from time to time IMO. For instance, the MC VOA shows P levels that are below the 600 ppm minimum required to meet API SM, whereas my UOA of the same oil shows normal Zn and P levels.

The 800 ppm API SM/SN limit on Phosphorous only applies to the energy conserving grades (XW20, XW30) and do not apply to the XW40 and XW50 grades. It's the Ford B-spec that imposes the 800 ppm P limitation on any compliant 5W50 motor oils.

I have only seen a UOA of M1 5W50 from a Porsche motor. If you have one from a GT500 please point me to it or post it if you can; I'd like to see how it performs.

The Group IV and V type oils are probably more shear stable than the Group III oils, but any of the 5W50 oils are prone to shear to a 40 grade over time and miles; IMO this is okay as long as you change it before it shears down to a 30 grade.

6-Speed

Interesting oil. Looks like a heavy 50 grade with a fairly high HTHS viscosity and low NOACK volitility (which is good). From their technical data it is a Group III/IV blend of base stocks with an additive package using Moly and no more than 800 ppm ZDDP based on these claims:

16. Enhanced vehicle emissions control system compatibility.
17. Extended vehicle emissions control system life.

http://www.schaefferoil.com/datapdf/9001.pdf

I'd like to see a VOA on this oil to get an idea of the contents of its additive package. It might contain some more exotic anti-wear additives.