Oil Change Question?

[BruceH]

Explain why the 5.0 is spec'd for 5w20 and 5w50... same motor. Exactly, 5w20 is only for CAFE. I've personally not seen much of a mpg loss running 5w30 in my 5.0.

I just don't believe the cafe thing, never have.

I could guess why but it would only be a guess. My guess would be the 5w is for the tight clearance and the 50 is due to sustained high rpm heat. It's meant for a different role than a daily driver and the sustained high heat of road racing would break down all but the stoutest oils. Does Ford spec the Motorcraft 5w-50 for it like in the GT500? Maybe Ford could answer your question?

Edit: Do you run 5w50 in your 5.0?

 

[OneQwkStang]

Looking to do the first oil change in my '13 GT. What oil do you guys recommend and weight?

Read the owners manual that came in the glove box man....

 

[Seer]

I just don't believe the cafe thing, never have.

I could guess why but it would only be a guess. My guess would be the 5w is for the tight clearance and the 50 is due to sustained high rpm heat. It's meant for a different role than a daily driver and the sustained high heat of road racing would break down all but the stoutest oils. Does Ford spec the Motorcraft 5w-50 for it like in the GT500? Maybe Ford could answer your question?

Edit: Do you run 5w50 in your 5.0?

Nope I run 10w30. The same 5.0 has two different specs. 5w20 is for CAFE and only CAFE. Ask a Ford powertrain engineer they will be political about it, but will eventually say the same thing. The engine is not so tightly spec'd it requires 5w20.

Yes Ford specs 5w50 in the Track Pack 5.0's, which have the exact same engine as the regular 5.0s

Unlike the 3v, the 5.0's VVT is not based upon oil pressure.

 

[rayS197]

5W20 just like Ford recommends...

Read the owners manual that came in the glove box man....

Best answers so far. There is a reason why Ford Spec'd that weight.

 

[fdjizm]

do it.

 

[Seer]

do it.

hey look its motorcraft 5w20

 

[BruceH]

Nope I run 10w30. The same 5.0 has two different specs. 5w20 is for CAFE and only CAFE. Ask a Ford powertrain engineer they will be political about it, but will eventually say the same thing. The engine is not so tightly spec'd it requires 5w20.

Yes Ford specs 5w50 in the Track Pack 5.0's, which have the exact same engine as the regular 5.0s

Unlike the 3v, the 5.0's VVT is not based upon oil pressure.

If Ford cared about mpg over durability so much then why not spec 5w-20 for the Boss and GT500?

I've never met a Ford powertrain engineer. I understand about the 5.0 vvt, that's why I never mentioned it as a reason.

I've used 5w-20, 0w-30, and 5w-30 in my 3v. IMO 0w-30 was the worst but I'm basing that on valvetrain noise. My valvetrain is quietist with 5w-20. I personally don't think 5w-30 is going to hurt a thing and stated as much. I really hope the 10w-30 works out for you, I can't see any reason for it but we all think differently and it's your motor. It seems to me that there is a commonality between oil pump failure, spun bearings, and valve train damage and 10w-x oil but I can't say I have anything other than an opinion and sometimes faulty memory based on spending too much time on forums.

Why not run the 5w-50 if you are concerned about oil breakdown? As I understand it only one company has the technology to meet the spec because it's such a wide range of viscosity.

 

[JEWC_Motorsports]

Bruce if its not about CAFE standards then why do almost all manufacturers recommend a 5w20 on vehicles that are supposed to average 27.5 mpg or better? Its not about clearances, its all about the government and what they want.

 

[BruceH]

Bruce if its not about CAFE standards then why do almost all manufacturers recommend a 5w20 on vehicles that are supposed to average 27.5 mpg or better? Its not about clearances, its all about the government and what they want.

I know that's a popular opinion. I just don't agree with it. Vehicles running 5w-20 still last along time. I tore my first built motor down at 15,000 miles and the bearings looked fine. It had been whippled the whole time and always had 5w-20. IIRC I made around 50 passes and a ton of dyno pulls with it.

The only reason I'm in this thread is because of the broad statement about idiots. Normally I wouldn't bite but today has been one of those days and I posted an unpoplular opinion in an oil thread, I know what that will bring. People have opinions. If I thought 5w-30 would work better for my application I'd use it.

I do alot of things that go against the norm. 5w-20 oil, built my motor with tty hardware on purpose, didn't torque plate hone, ptb is set to .0015", I'm using a Mach 1 block, Mahle 4032 pistons, E85, stock cats, self tuning, etc.

I know that if something happens it will be because of me. If I was running higher rpms all the time I would use a different oil weight but I'm not taking the car to redline every time I drive it. I doubt the op is either.

 

[Seer]

If Ford cared about mpg over durability so much then why not spec 5w-20 for the Boss and GT500?

I've never met a Ford powertrain engineer. I understand about the 5.0 vvt, that's why I never mentioned it as a reason.

I've used 5w-20, 0w-30, and 5w-30 in my 3v. IMO 0w-30 was the worst but I'm basing that on valvetrain noise. My valvetrain is quietist with 5w-20. I personally don't think 5w-30 is going to hurt a thing and stated as much. I really hope the 10w-30 works out for you, I can't see any reason for it but we all think differently and it's your motor. It seems to me that there is a commonality between oil pump failure, spun bearings, and valve train damage and 10w-x oil but I can't say I have anything other than an opinion and sometimes faulty memory based on spending too much time on forums.

Why not run the 5w-50 if you are concerned about oil breakdown? As I understand it only one company has the technology to meet the spec because it's such a wide range of viscosity.

gt500 and boss are limited production vehicles. their averages dont go against cafe standards.

It's also cheaper to warranty a few engines than it is to pay government fines.

 

[BruceH]

gt500 and boss are limited production vehicles. their averages dont go against cafe standards.

It's also cheaper to warranty a few engines than it is to pay government fines.

Can't disagree with that. Sound logic. I still think it's an internet bitog "gubment" myth though, lol.

People run mod motors for along time in stock configuration with 5w-20. Honda uses it in their vehicles and their longevity reputation is well known. They also factory fill with a special break in oil, at least they used to.

So how does it get better mileage? Less windage?

 

[JEWC_Motorsports]

CAFE Standards are what they are, its not an opinion. I run Amsoil 5w30 and my engine runs quieter than when it had 5w20 in it, no more annoying tick. Thats reason enough for me.

 

[Mystickeith50]

Bruce if its not about CAFE standards then why do almost all manufacturers recommend a 5w20 on vehicles that are supposed to average 27.5 mpg or better? Its not about clearances, its all about the government and what they want.

CAFE Standards are what they are, its not an opinion. I run Amsoil 5w30 and my engine runs quieter than when it had 5w20 in it, no more annoying tick. Thats reason enough for me.

Bruce first off, I didn't say "Bruce ur an idiot" Lol. Maybe I shouldnt have used idiot....fair enough. But CAFE is CAFE. Its not made up. You are obviously more knowledgeable than me, but if your going to tell me its required for the tighter tolerances of the ford modular engine I have to disagree. Christ I can only assume Ferrari and Lamborghini's engines are made to some pretty tight toterance and they take 5-30 and 5-40 respectively. I know its not comparing apples to apples but....

 

[BruceH]

CAFE Standards are what they are, its not an opinion. I run Amsoil 5w30 and my engine runs quieter than when it had 5w20 in it, no more annoying tick. Thats reason enough for me.

Here's what I really can't buy into. According to the conventional wisdom 5w-20 gets better mileage than 5w-30 but it's bad for the motor. To me that makes no sense whatsoever. Better efficiency would be obtained with less friction between moving parts. More wear would result with more friction. The only thing I can think of would be windage. But even with that if 5w-20 caused more wear there would be more friction which would cause the motor to be more inefficient.

 

[JEWC_Motorsports]

Bruce i dont think it will cause any damage if used as FORD intended. I wouldnt spin a 5w20 engine to 7-7500 all the time. Thats just my preference.

 

[AnotherS197GT]

Bruce, do you have any idea what the clearances are on older 4.6s? The early 4.6s in panther cars used 5 quarts of 5w30, then they switched to 5 quarts of 5w20, and now 6 quarts of the 5w20. These are all 2V cars though.

I'm also a little curious about some EB vehicles. IIRC 2010 EB vehicles call for 5w20, but the 2011+ call for 5w30.

 

[Bullett]

So then I shouldn't run 10w30 in my Paxton 5.0?

 

[JEWC_Motorsports]

Bullet you can, its always hot in your part of the world.

 

[Grabber]

Pretty sure that GT500's run 5W50 stock.

Ford also recommends running only 5 quartd even though most use 6-6.5 quarts. Ford recommends using only motorcraft oil, not royal purple, amsoil, etc. I guess Ford branded diff fluid and tranny fluid is better than all of the aftermarkets fluids too.

There are a large number of things Ford says to do.

Everyone will have their own preferences on what they feel is right. Going by what Ford says is the safest way at minimum to run your car normally, but not necessarily optimally.



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[JoshK]

It's a 5.blow, it won't last anyway

/thread