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5W50 of 5W20 for the Mustang GT?

m6pwr

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This thread is pretty much dead, but I'll add to it anyway.

I sent a note to the Driven oils tech line about the OP's question. I asked about HPDE Driver's Schools with a bone stock 2015 Mustang GT 5.0 PP. Driven oils make performance oriented PAO grp IV oils, including some focused on Ford engines. Here's their response:

Richard,

Thanks for the email. If Ford specs 5W-20, then stay with a 5W-20. The FR20 (Driven's PAO 5w20 for street) can handle the rigors of track day use without generating the extra oil pressure and oil temp that a 5W-50 would produce.

Thanks,

Lake Speed Jr.
Certified Lubrication Specialist & Oil Monitoring Analyst
Driven Racing Oil
13201 Reese Blvd W, Suite 200
Huntersville, NC 28078

I also called Ford's Racing Tech Line (800-367-3788) and got essentially the same answer: stick with 5w20 viscosity because that's what the engine is designed for, particularly the cam phasers; maybe upgrade to a full synthetic or racing oil, but stay at 5w20.
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Todd15Fastback

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:lol: I'm just quoting this so we can be reminded of how it all works.
I am sure he appreciates this coming from a kid that stays in his parents basement and knows more than Ford does about their own engines and how they behave under extended load periods.
 

daytripper

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This thread is pretty much dead, but I'll add to it anyway.

I sent a note to the Driven oils tech line about the OP's question. I asked about HPDE Driver's Schools with a bone stock 2015 Mustang GT 5.0 PP. Driven oils make performance oriented PAO grp IV oils, including some focused on Ford engines. Here's their response:

Richard,

Thanks for the email. If Ford specs 5W-20, then stay with a 5W-20. The FR20 (Driven's PAO 5w20 for street) can handle the rigors of track day use without generating the extra oil pressure and oil temp that a 5W-50 would produce.

Thanks,

Lake Speed Jr.
Certified Lubrication Specialist & Oil Monitoring Analyst
Driven Racing Oil
13201 Reese Blvd W, Suite 200
Huntersville, NC 28078

I also called Ford's Racing Tech Line (800-367-3788) and got essentially the same answer: stick with 5w20 viscosity because that's what the engine is designed for, particularly the cam phasers; maybe upgrade to a full synthetic or racing oil, but stay at 5w20.
Thanx for sharing this.I doubt anyone here would have the bonifides to provide a more definitive answer.
 

m6pwr

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Andre, thanks for the link. The author, Dr. A.E. Hass, is a plastic surgeon who owns Bentleys and Ferraris, and maybe some other marques. He is (or was) well known on the BITOG oil forum, although it's been some years since I've seen him post on BITOG. I tried reading his dissertation in the link, but my brain timed out in about the middle of Oil 103. IIRC, he was actually a fan of thin oils before it became very fashionable to be so and he often got a lot of flack for his opinions in that regard.
 

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AndreG

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Andre, thanks for the link. The author, Dr. A.E. Hass, is a plastic surgeon who owns Bentleys and Ferraris, and maybe some other marques. He is (or was) well known on the BITOG oil forum, although it's been some years since I've seen him post on BITOG. I tried reading his dissertation in the link, but my brain timed out in about the middle of Oil 103. IIRC, he was actually a fan of thin oils before it became very fashionable to be so and he often got a lot of flack for his opinions in that regard.
Very interesting, he seems like a bright man! I read the whole thing. Basically here is the TLDR:

"The best way to figure out what viscosity of oil you need is to drive the car in the conditions you will use. Then use the oil viscosity that gives you 10 PSI per 1,000 RPM under those circumstances."

In my video my needle goes to what it looks like 60-70 which in theory is exactly where I should be. It's shaky but at high revs I can clearly see it at around 70 if the light catches it right.

My needle works because right now it pegs out at 90psi when cold if I raise the revs a little.

P.S. by my needle I mean the needle in my video, that was my camera, not my car though :D

edit: I'm using 5-30 right now and it seems to be way too thick for everyday driving. Too much pressure at low rpms. Not sure if I can get it to the right pressures on the street, my commute is really short and I haven't gone out just to try.
 

Tim Hilliard

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I am sure he appreciates this coming from a kid that stays in his parents basement and knows more than Ford does about their own engines and how they behave under extended load periods.
It's ok Todd, I take more satisfaction in knowing what I know than what I read on the internet. Oh and I downloaded the 5.0 engine specs . .001" oil clearance. Main Bearings are fitted to the engine based on a chart Ford has that compares the code on the crank to the code on the block and gives you the bearing to run. In layman's terms the 5.0 is a precise piece as it leaves Dearborn. Depending on the finished size determines bearing used. I will continue to use the oil I'm using. Assembly calls for the oil I'm using, not assembly lube, blended 5-20. So to all that said just put X in it....have fun with that. Stuffing a high vicosity oil through a .001" space spinning a 2.6" diameter shaft at 7K rpm will make so much drag even at elevated temps Im pretty sure you'd be able to bury the oil temp gauge. Friction causes heat, from cavitation/aeration because the oil wedge is not making solid contact with the surfaces. Plus add in the HP required to over work the oil pump...recipe for success. I'll stick with what I know. :cheers:
 

Niz55

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Just changed my oil at 3500 miles with ford fully syntetic 5w-20. She sounds and drives beautiful .
 

Asharus

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i thought the coyotes are made in canada somewhere, not dearborn
 

Tim Hilliard

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i thought the coyotes are made in canada somewhere, not dearborn
Really Dude? You buying the engine or the car? I knew some Hero was going to feel the need to point that out SMH
 

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AndreG

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Really Dude? You buying the engine or the car? I knew some Hero was going to feel the need to point that out SMH
Has anyone ever told you that you take everything way too seriously?

Anyways, I bet you my thicker oil makes my stang WAY faster around thompson. Specially in combination with 255 tires all around which reduce drag compared to the wider rears.
 

Tim Hilliard

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So take the advice of a guy on the internet thats talking about cars that have nothing to do with this forum?
not the manufacturer of the car you drive Andre?

The best part is you quote me earlier I assume as a dig but then you quote this other guy who says the same thing but due to your inability to understand the most basic concepts of the subject you don't even know. You win the Internet today...for my enjoyment.
 

Asharus

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i bought the car for the engine. the car was probably designed in dearborn but built in flat rock.
 

Tim Hilliard

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Has anyone ever told you that you take everything way too seriously?

Anyways, I bet you my thicker oil makes my stang WAY faster around thompson. Specially in combination with 255 tires all around which reduce drag compared to the wider rears.
No people actually use this as a source of credible information. You have zero credibilty. Your highlight video is embarrassing a lot of off track and a lot of getting passed. Do you think you are the only one to do Skippys program? I paid for mine with my own money.
 

Rubred50

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ford synthetic here at 5k miles...5w20
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