2011 GT 5.0 L Mustang

[Ben99GT]

Originally Posted By: mount
And he's not making 200hp over stock as you keep insisting. It's more around 100hp. Not an overly significant amount when you start with a 412.


OVERK1LL is right, as far as the engine (and oil) are concerned it's more like 200 HP. Superchargers waste a significant amount of HP being driven. This is why nitrous, turbos, and N/A setups require so much less fuel/fuel system for a given power level.

 

[OVERKILL]

Originally Posted By: Ben99GT
Originally Posted By: mount
And he's not making 200hp over stock as you keep insisting. It's more around 100hp. Not an overly significant amount when you start with a 412.


OVERK1LL is right, as far as the engine (and oil) are concerned it's more like 200 HP. Superchargers waste a significant amount of HP being driven. This is why nitrous, turbos, and N/A setups require so much less fuel/fuel system for a given power level.



Thank you Ben.

I mentioned early on that the 200HP was based on the inclusion of the power required to drive the blower

 

[SteveSRT8]

^^^bet no one heard that.

 

[CATERHAM]

Originally Posted By: Mitch Alsup
Originally Posted By: OVERK1LL
Redline 5w20 has an HTHS of 3.3. In comparison, PP 5w30 and 10w30 respectively have HTHS values of 3.1 and 3.15. Your friend is effectively running a heavy 30-weight.

M1 0w40 isn't much heavier with an HTHS of 3.8, which is the same as Redline's 5w30.


Yet;
Redline 10w30 has an HTHS of 3.8.

The real question is how does one determine the HTHS number one wants for variaous applications, one of them being track use.
How does one determine the HTHSV value for track use? Very easily, just install an oil pressure gauge and an oil temp' gauge. Since HTHSV correlates very closely with oil pressure, and therefore is the most relavent viscosity measure in choosing how thick or thin the oil you want will be, that's what you rely upon.
I discussed the procedure in the following thread:

https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2276634&page=1

 

[jaj]

I just bumped into this thread today, so I'm bringing it back from the dead long enough to offer up my two bits worth. I have a supercharged 2011 Mustang GT and all of the issues discussed here have been hashed over on other forums. I have my own views as well.

First, the facts are that 2011 and newer Ford Mustang GT's have two oils specified in their owner's manuals:
- Mustang GT - 5w-20 conventional oil
- Boss 302 and GT500 - 5w-50 synthetic - Motorcraft is the only brand that meets the spec
- Mustang GT Track Pack (2013 model year) - 5w-50 synthetic - Motorcraft is the only brand that meets the spec

The 2013 GT Track Pack includes the larger Boss 302 radiator and oil-to-water oil cooler but the engine is an ordinary GT Coyote. In 2013 Ford eliminated the piston cooling jets from this engine and changed the coating on the pistons. Presumably that reduced costs.

So, the way Ford looks at it is that if you're going to run a 5.0 Coyote-based Mustang engine hot at a track, then they spec 5w-50 in the Owner's Manual. If not, the spec 5w-20.

The article describing the development of the Roadrunner engine for the Boss 302 (quoted earlier in this thread) says that Ford switched the oil from 5w-20 conventional to 5w-50 synthetic for two reasons: to improve oil pressure at hot idle and to reduce aeration at high RPM's. No discussion of film strength or flow.

Motorcraft 5w-50 rapidly shears to a 40 weight in use. Using a 40 weight oil that doesn't shear is a reasonable choice, although it won't meet Ford's specs.

As for my situation, I ran the factory fill until the OLM said to change it. I then ran Mobil 1 0w-40 for one OCI, and currently I'm using Pennzoil Ultra 5w30. I've installed an oil temp gauge and I've never seen an oil temp over 120 degrees C at the track. UOA's are unremarkable. I'll probably drop to 5w-20 after I've seen the 5w30 UOA results. There's really no reason not to.

 

[hattaresguy]

I think Mobil 1 0w40 would work pretty well. It does fine in high HP force fed German motors.

You might want to look into adding an oil temp gauge and a larger oil cooler if you plan on running it hard.

 

[Garak]

Originally Posted By: jaj
- Boss 302 and GT500 - 5w-50 synthetic - Motorcraft is the only brand that meets the spec
- Mustang GT Track Pack (2013 model year) - 5w-50 synthetic - Motorcraft is the only brand that meets the spec


For what it's worth, the old version of Castrol Syntec 5w-50 did meet the specification and was so labeled. The new version does not, or is at least not labeled as such.

 

[jaj]

Originally Posted By: Garak
...For what it's worth, the old version of Castrol Syntec 5w-50 did meet the specification and was so labeled. The new version does not, or is at least not labeled as such.


That's correct - I think there was a Pennzoil Platinum that met the "A" spec as well, but so far nobody has come out with a "B" spec competitor to the Motorcraft 5w-50. The change in spec coincided with API SN, so it could just be that the 5w-50's are slow catching up because they're not at the top of the Castrol and Pennzoil to-do lists.

 

[jaj]

Originally Posted By: hattaresguy
I think Mobil 1 0w40 would work pretty well. It does fine in high HP force fed German motors.

You might want to look into adding an oil temp gauge and a larger oil cooler if you plan on running it hard.


I agree - I have the Boss 302 cooler on mine and a digital gauge that uses a thermocouple pasted to the side of the oil pan (out of the breeze and covered with a patch of glued on insulation). The cooler takes about an hour to install and for $120 from Ford Racing as a complete kit of parts it's cheap insurance. Because all the parts are OEM Ford, it actually fits without any drama. Works pretty good too.