now, lets talk oil!

[Mr. Happy]

Coming from an LS3 Grand Sport, and all the verbiage I had read,,, the general consensus is to NOT hammer the motor until the oil is above 150f.

This. It's generally a reasonable idea to not go WOT a lot or rev high until the car is mostly up to temp. And the coolant temp gauge comes up a lot faster than oil temp.

This shouldn't be an issue for most since the car will have enough temp in it to go balls out after 2-4 miles depending on outside temps.

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[AMpowerJ]

After skimming that very informative article on oil I paid attention to my oil temps and pressures today. After two 5 mile trips with normal driving, 2750 RPMs cruising in 5th gear at 60 mph and never revving over 4K RPMs my oil temps were just at 175 degrees with it being 45 degrees outside. That seems a little low for me and I worry about the oil being too thick at that temp.

I noticed that oil pressure was about 125psi initially with the oil being cold and it settled at around 90psi. I have Amsoil 5W50 in it right now. If you follow the rule of 10psi per 1K RPMs on your engine the most oil pressure we really should ever need is around 83psi, if I understand the rule correctly. So I think the 5W50 oil is for sure a little heavy for just driving around especially in the colder months.

So I think I will probably use 0W40 for the cooler months and run 5W50 in it during track season which coincides with warmer temps anyway. I think this will be a good compromise. As other's have pointed out, you could probably run 0W30 and be fine just on the street. It will be interesting to see if this change affects oil temps and pressures.

 

[mustang_guy]

After skimming that very informative article on oil I paid attention to my oil temps and pressures today. After two 5 mile trips with normal driving, 2750 RPMs cruising in 5th gear at 60 mph and never revving over 4K RPMs my oil temps were just at 175 degrees with it being 45 degrees outside. That seems a little low for me and I worry about the oil being too thick at that temp.

I noticed that oil pressure was about 125psi initially with the oil being cold and it settled at around 90psi. I have Amsoil 5W50 in it right now. If you follow the rule of 10psi per 1K RPMs on your engine the most oil pressure we really should ever need is around 83psi, if I understand the rule correctly. So I think the 5W50 oil is for sure a little heavy for just driving around especially in the colder months.

So I think I will probably use 0W40 for the cooler months and run 5W50 in it during track season which coincides with warmer temps anyway. I think this will be a good compromise. As other's have pointed out, you could probably run 0W30 and be fine just on the street. It will be interesting to see if this change affects oil temps and pressures.

Youll find 5w50 too much for summer as well on the streets. This is what ive been trying to tell people. :cheers:

 

[AMpowerJ]

Youll find 5w50 too much for summer as well on the streets. This is what ive been trying to tell people. :cheers:

Yeah I don't disagree but I think it will be a little too impractical and expensive to change the oil back and forth just for a track day here and there.

 

[mustang_guy]

Yeah I don't disagree but I think it will be a little too impractical and expensive to change the oil back and forth just for a track day here and there.

Unless you can race as ggressively as the stig 5w40 amsoil will be fine year round.. It hardly gets into the teens or single digits there. If im not mistaken.

 

[dgc333]

Except not all "5W"s are the same viscosity at cold temperatures:

cSt [MENTION=17112]10[/MENTION]0*F:

Pennzoil Ultra 5W30 - 57.5
Mobil 1 HM 5W30 - 69.2
Castrol EDGE OE Professional 5W30 - 71
Shell Rotella T6 5W40 - 87
Mobil 1 5W50 - 104.9
Motorcraft 5W50 - 136


This is a good read: http://www.bobistheoilguy.com/motor-oil-101/

All 5w oils have the same viscosity at zero F +/- a tolerance. And all 5w-30's have the same viscosity at 212F +/- a tolerance.

Your example is at 100F which is about mid point between the cold rating and the hot rating. The specific additive package of the oil is going impact how the viscosity changes with temperature between the two ratings and the viscosity differences between the 3 5w-30's at 100F seem quite reasonable. The 5w-50's should be much higher at 100F and they are.

Dave

 

[Hack]

I noticed that oil pressure was about 125psi initially with the oil being cold and it settled at around 90psi. I have Amsoil 5W50 in it right now. If you follow the rule of 10psi per 1K RPMs on your engine the most oil pressure we really should ever need is around 83psi, if I understand the rule correctly. So I think the 5W50 oil is for sure a little heavy for just driving around especially in the colder months.

The TiVCT Ford engines have higher oil pressures than the old pushrod engines your rule of thumb is based on. The oil pressure is used to change cam timing, not just for lubrication.

on edit: since you changed from the oil that Ford recommends your pressures might be slightly different than if you had run the Motorcraft oil. However, with a newly designed and built engine running 5w 50 oil it's my opinion that whatever pressures you are seeing are correct for the motor. I've also noticed that the pressures are high. I never really looked at oil pressure in my 2015 GT, but then it wasn't right in front of me on a gage all the time. I guess that's the risk Ford takes by putting the information out there - someone might decide they think something is wrong and then act on that opinion. I can see that if what the people on this thread are saying about how the Motorcraft oil shears down and loses viscosity is true - the Motorcraft oil will have slightly lower oil pressures when warm compared to a boutique oil that doesn't shear as much. It's probably what the engineers designed the engine to work with, and an oil that doesn't shear down will be a little thicker than preferred.

 

[Stuntman]

All 5w oils have the same viscosity at zero F +/- a tolerance. And all 5w-30's have the same viscosity at 212F +/- a tolerance.

Your example is at 100F which is about mid point between the cold rating and the hot rating. The specific additive package of the oil is going impact how the viscosity changes with temperature between the two ratings and the viscosity differences between the 3 5w-30's at 100F seem quite reasonable. The 5w-50's should be much higher at 100F and they are.

Dave

Can you provide a source for the claim that all 5W oils have the same viscosity at 0*F? I don't think there's a standard cSt range for X"W" ratings like their are of the standard viscosity grades (weights) -which are measured at 100*C.

BITOG does not clearly define what makes a cold "winter" (W) rating and it sounds rather complex and vague to determine those weights:

http://www.bobistheoilguy.com/motor-oil-107/

Since 40*C & 100*C (100*F & 212*F) are standard temperatures for measuring cSt viscosity, the viscosity at 100*F (40C) gives you a decent idea of the thickness during a 'cold' start -assuming you live in Arizona. Unfortunately there aren't any other viscosity parameters that are commonly published at freezing temperatures.

At 100*C

M1 10W30 - 10.1 cSt
Amsoil 10W30 - 11.7 cSt
Castrol EDGE 0W40 - 12.21 cSt
Redline 0W40 - 15.4 cSt
M1 5W50 - 16.95 cSt
Motorcraft 5W50 - 21 cSt

At the end of the day, these spreads aren't huge within the same weight, but there can be a pretty big spread (5.3 cSt) between a thick 40W and a thin 30W. If you're already going to go thinner with a 40W and pick a 'light' 40W, it can shear down to a mid to low 30W, which is a pretty big difference from the stock oil...

 

[DaveH]

I'm about to do my first oil change at 1000 miles, but having only ever owned European cars, I'm unfamiliar with the preferred brands for US cars.

I was about to pull the trigger on the Amsoil 5w50 but noticed it meets the WSS-M2C931-C specification. However, in the owners manual, it states WSS-M2C931-B is the desired specification.

Is C simply better than B or am I rolling the dice by not going with exactly what Ford want us to put in?

 

[mattlqx]

C supercedes B. So yes, C is simply better than B.

http://infostore.saiglobal.com/store/Details.aspx?productID=1598801

 

[DaveH]

C supercedes B. So yes, C is simply better than B.

http://infostore.saiglobal.com/store/Details.aspx?productID=1598801

Wonderful, thank you so much sir.

I'll order my case tonight.

I hear you have a source for filters too?

 

[mattlqx]

Tasca is pretty cheap. Haven't seen much cheaper. http://www.tascaparts.com/ford/FL-2069-ST

 

[ThreeFiveO]

Hey Matt
What type and weight did you end up using? I'm torn with all the tech talk and am getting close to my first change.

 

[mattlqx]

I had a bunch of OE Motorcraft 5W50 left over from my Boss, so I'm on that for the next change or two. I'll probably try Amsoil 5W50 after that since everyone has good things to say about it. Sticking with the same weight because it's likely that every change will see at least one track day.

 

[ThreeFiveO]

Thanks I'm probably going Amsoil too. Seems to be the consensus.
I need to get myself one of those "action avatar photos"

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