Official UOA thread with oil poll

What oil are you currently using in your Shelby 5.4L?


  • Total voters
    449
  • Poll closed .

gqneon

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Is UB still active? I messaged him but maybe he’s not here currently.

I have a 15 GT with OPG/sprocket and Whipple stage 2 but otherwise the motors stock. I’m trying to decide between switching from Amsoil XL 5W-20 to either (signature Amsoil) 5W-20, 5W-30, 0W-40 or what. Cruising, a few drag passes a year maybe, mostly highway pulls or just living in the torque curve when there’s no one around. 93 pump gas, about to be dyno tuned when I add some long tubes in a few weeks.

Curious what the gurus feel is best, especially since Amsoil just updated their additive packages.
 

biminiLX

never stock
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Only thing I'd feel uncomfortable with on the coyotes is the VCT and if the oil viscosity is really important?
I think I, switching to Mobil Euro 0w40 as it's easy for me to find at a great price from local MB dealer and showed great results in a testing page I liked.
I've been running Amaoil but not sure worth the hassle for frequent E85 changes.
-J
 

UnleashedBeast

Engine Lubrication Guru
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Just want to confirm that my research and line of thinking is correct.

Car: 2014 GT500 (non track pack)
Mods: 800rwhp bolt ons
Fuel: E85
Use: Street runs, drag strip, cruising
Area: South Texas

From what I have searched, the two options are:
1) Amsoil AZF 0W-40
2) Amsoil AMR 5w-50

Filter: Amsoil Ea011

If someone could confirm, or offer another option I would appreciate.

What power adder? Supercharger or Turbo?

In my Armageddon TT 2014 GT I had to run Amsoil 5W-50. 10W-30 was too light, causing a tapping noise at low rpm. I guess the turbos were taking away too much oil pressure at idle and right above idle. I'd suggest using 5W-50 at your intended power level.
 

UnleashedBeast

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Only thing I'd feel uncomfortable with on the coyotes is the VCT and if the oil viscosity is really important?
I think I, switching to Mobil Euro 0w40 as it's easy for me to find at a great price from local MB dealer and showed great results in a testing page I liked.
I've been running Amaoil but not sure worth the hassle for frequent E85 changes.
-J

If you don't have oil fuel dilution issues, there is no need to change your oil more frequently than if you were setup for gasoline. Only an oil test will be able to tell you that.

UOA testing kit
 

biminiLX

never stock
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Bumping to top, haven’t seen UnleasedBeast in a while.
Another member asked about the oil thread, would be nice to see new data/options.
-J
 

Jam421

Jam421
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Sep 15, 2010
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Long Island NY
Can I ask what are the advantages of lower viscosity such as Amsoil 0W-40? Does the thinner oil get up in the main bearings more efficiently on a street driven, occasional drag race , Stock with FBO's? A shop once told me the thinner viscosity revs up faster. I was not too convinced of that.
 

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