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Old 04-27-2015, 08:04 PM   #1
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Confused about something

So as my profile says i own a ST and it calls for 5w30 oil , now i looked at the ecoboost mustang oil spec and its call for 5w20 and it's more powerful then the ST. Also i looked at the spec for the 5w20 and it seems more durable then the w30
Anyone can explain why 350 hp Mustang use lower grade oil?


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Old 04-27-2015, 10:39 PM   #2
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ITS not the grade per se. But the viscosity.
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Old 04-27-2015, 11:04 PM   #3
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Moved to "Focus ST".
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Old 04-28-2015, 05:31 AM   #4
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Trend is toward the lightest oil possible for more power/efficiency.

5/30 in the ST is a CYA for the engine when the design was newer - I'm sure the redesign made it better, but whether that affected durability much or if additional experience with it allowed the changed recommendation is an open question.
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Old 04-28-2015, 12:26 PM   #5
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The 2.3 Ecoboost is a newer design.It may have different internal 'specs' which allow it to safely use 5W20.
The ST 2.0 calls for 5W30.. (It probably has internal 'specs' which go well with 5W30) and since the warranty for the engine would be void if 5W20 was used in the ST 2.0 Ecoboost... I suggest sticking to the oil recommended.. At least until your warranty is gone.

I too would switch to 5W20 if it was an option in the ST. It is not.
(though many members have complained of dealers putting in 5W20 by mistake.. Imagine how many ST owners never noticed??)

The cost, if Ford decided to invalidate the engine warranty is to high to offset the energy savings IMO. (gain of a mpg or so and maybe two hp?? Just guessing here)
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Old 04-28-2015, 06:29 PM   #6
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I am not looking to use 5w20 , i was just surprised to see that a most powerful mustang use a lower grade oil
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Old 04-28-2015, 10:59 PM   #7
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It's not really a quality difference, in some ways an oil with less viscosity "range" is actually superior.

The important part is matching the type to the individual engine design & tested performance with the selected oil viscosity.

Too thick can be less than ideal as well as too thin.
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Old 04-28-2015, 11:19 PM   #8
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It's not lower grade, just different. It doesn't even cost less...

Get it out of your head that there are any performance differences between those oil weights. Oil weight is determined by the components used in the engine, and the anticipated use of the engine (racing applications, etc).
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Old 04-28-2015, 11:21 PM   #9
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It should also be mentioned that the 5.0 coyote engine also uses 5w-20. Again, not a lower "grade", just different viscosity. The track pack Mustangs recommend 5w-50 for racing use due to heat concerns.
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Old 04-29-2015, 02:38 PM   #10
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Quote:
Originally Posted by dieselboy77 View Post
So as my profile says i own a ST and it calls for 5w30 oil , now i looked at the ecoboost mustang oil spec and its call for 5w20 and it's more powerful then the ST. Also i looked at the spec for the 5w20 and it seems more durable then the w30
Anyone can explain why 350 hp Mustang use lower grade oil?

I believe it's not because the Mustang engine has more power but rather it's because it is a newer design.

The question is what is the recommended oil in the "new and improved" (twin-scroll turbo) 2.0L EcoBoost that will undoubtedly end up in the ST at some point in the future.
It's likely to be 5W20 as well.

It seems that the latest generation of engines from Ford are all designed to work with 5W-20.
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