I hate "What oil threads?"....But..?

[HISSMAN]

we always use the oem recommended

Coming from someone that runs the guts out of their engines...

That might be the best educated answer so far.

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[jasonstang]

I remember BMW didn't have their M3 designed to run 5w50 oil, many people had rod bearing failure because the clearance was too tight for 5w50 causing the oil to not flow fast enough to remove the heat. Remember, heavier oil also means slower flow and actually the new trend is faster flow keeping everything cooler is better than more pressure. I mean that little bit of pressure like 90psi is not gonna suspend the bearings which normally see between 6000-10000psi.
Here is what I found worth referencing:
http://www.enginebuildermag.com/2015/12/engine-bearings-under-pressure/
Here are some recommended rod bearing oil clearances for various oil viscosities:
.0015 to .0018 for 5W-20 or 20W
.002 to .0024 for 5W-30 or 30W
.0025 to .0029 for 10W-40 or 40W
.0030 to .004 for 20W-50 or 50W
.0041 to .005 for 10W-60 or 60W
For main bearings:
.0015 to .002 for 5W-20 or 20W
.002 to .0025 for 5W-30 or 30W
.0026 to .003 for 10W-40 or 40W
.0031 to .0041 for 20W-50 or 50W
.0042 to .0052 for 10W-60 or 60W

 

[Olivas]

Oil thread... opcorn:

 

[HISSMAN]

Oil thread... opcorn:

Exactly.. LOL

In any case, I just placed an order for Amsoil Signature 5w-20, two minutes ago. It's worked so far. I'll just keep an eye on my oil pressure and temps.

Thanks everyone!

 

[Jay-rod427]

5-30 would be ok. Wouldn't go any higher than that personally. Any quality full synthetic will be just fine on the track. Key word FULL synthetic, which there is very few anymore.

 

[Olivas]

5w-30 myself, but I'm in Phoenix where summer temps can get 110+ and we never (well extremely rarely) see temps below 30.

 

[jasonstang]

5w-30 myself, but I'm in Phoenix where summer temps can get 110+ and we never (well extremely rarely) see temps below 30.

The thing though, unless your engine is aircooled, the engine is pretty much regulated to a certain temperature range under normal drivng. Now if you are on a race track then the temperature can get pretty hot.
I believe the Mustang also has an oil heat exchanger so the oil temp should be well regulated under normal driving conditions.

 

[Jay-rod427]

Exactly.. LOL

In any case, I just placed an order for Amsoil Signature 5w-20, two minutes ago. It's worked so far. I'll just keep an eye on my oil pressure and temps.

Thanks everyone!

Hard to go wrong with Amsoil SS(it's what I use;)). Back when I was a tech at GM they were first introducing M1 (back then was still full synthetic) in the LS engines from the factory saw a study done on synthetic oil. For all the non believers synthetic oil does NOT lubricate any better than dino oil, but it does however maintain a lower temperature, and resists breakdown far superior. The horsepower and fuel economy claims back then were correct as the engine was running cooler on the internals than dino oil. The study even went so far as to manually heating the oil pan to the same operating temp as dino oil and it made the same horsepower.

 

[Strokerswild]

 

[bl4d3runn3r]

which oil does Ford recommend for the 2017 Mustang GT?

 

[jasonstang]

which oil does Ford recommend for the 2017 Mustang GT?

RTFM!

 

[Stuntman]

Where? In the owner's manual?

Ford tech line for heavily tracked cars, and that's what the Ford Racing School uses in their S550 GTs -which have the hardest life if any S550.

It depends on the application. Track use? Revving higher than stock? -a thicker oil would add additional protection over the stock 0W20.

5W20 is used for MPGs here. But regardless of why it's used, that is the oil weight the engine is designed to use.

The BOSS and Track Pack of 2012-2014 used 5W50 from the factory, but there were differences (I can't remember what they were, I read about it awhile ago) in those engines, and they were made to run that weight oil.

If I were in your position, I'd use the OEM weight oil, and find the highest quality oil. Of course, all oils are good now, so it's not hard. Hell, you can get Mobil1 and Royal Purple at Walmart now. And I think you meant to type that you use Amsoil now, and that's great stuff too.

Track packs didn't have different bearings from regular GTs

I remember BMW didn't have their M3 designed to run 5w50 oil, many people had rod bearing failure because the clearance was too tight for 5w50 causing the oil to not flow fast enough to remove the heat. Remember, heavier oil also means slower flow and actually the new trend is faster flow keeping everything cooler is better than more pressure. I mean that little bit of pressure like 90psi is not gonna suspend the bearings which normally see between 6000-10000psi.
Here is what I found worth referencing:
http://www.enginebuildermag.com/2015/12/engine-bearings-under-pressure/
Here are some recommended rod bearing oil clearances for various oil viscosities:
.0015 to .0018 for 5W-20 or 20W
.002 to .0024 for 5W-30 or 30W
.0025 to .0029 for 10W-40 or 40W
.0030 to .004 for 20W-50 or 50W
.0041 to .005 for 10W-60 or 60W
For main bearings:
.0015 to .002 for 5W-20 or 20W
.002 to .0025 for 5W-30 or 30W
.0026 to .003 for 10W-40 or 40W
.0031 to .0041 for 20W-50 or 50W
.0042 to .0052 for 10W-60 or 60W

E46-E9X M3s were designed to run a 10W60, not a 5W50. However the Castrol TWS 10W60 was a thin 60 -more like a 50 weight. Likewise the Motorcraft 5W50 is a thin 50 and more like a 40 weight.

Thinner oil didn't necessarily help the bearing problem. The main issue is revving the engine or working it hard before the engine gets up to operating temp and thins out the oil. Those tight tolerances killed bearings when their ignorant BMW owners beat on them and rev them at C&C with cold motors. A thinner 0W40 would help that issue slightly but the problem is not letting the engine warm up properly. The S54 & S65 were pretty much race motors for the street. You can't beat on them until they're warmed up. But that goes for the longevity of any motor.

0.02

 

[2015 Silver GT]

The BOSS and Track Pack of 2012-2014 used 5W50 from the factory, but there were differences (I can't remember what they were, I read about it awhile ago) in those engines, and they were made to run that weight oil.

Track Pack cars had the same engines as the regular GT's. That caused a lot of confusion since they called for 5W-50 and the regular GT's called for 5W-20.

 

[Stuntman]

Track Pack cars had the same engines as the regular GT's. That caused a lot of confusion since they called for 5W-50 and the regular GT's called for 5W-20.

Yup. For regular use, 5W20 was specified for mileage, but for heavy track use, 5W50 does a better job at protecting the engine.

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