Oh yeah lol.

 

The problem is, the oil chemists know everything and anything about oil formulations...

BUT, they know nothing about how those formulations are going to affect the TIVCT in the 5.0 Coyote. They don't have any experience, and any advice is going to be pure speculation.

 

 

I love that dealer mechanics are now the subject matter experts on this.

Anyway stop spreading mis-information. You should NOT change the oil viscosity from what your car was factory equip'ed with.

The engine calibration is viscosity specific and there are implications to changing it.
The Boss 302 calibration for TiVCT had to be tweaked to accommodate the 5w-50 oil.

You should not deviate from factory oil viscosity specifications period

 

This. Some people get the info from the proper sources. Techs might understand some, but engineers and the team that calibrate these motors are going to be the final word on this. As of now I'm going to lock this unless someone can provide information contrary to what Stinger has provided.

 

My thread was closed pertaining to the discussion on using a different oil viscosity. I'll assume this one will get the same treatment....

To respond to the comment of ASE certified/Ford certified, the mechanics I talked with are Ford certified as well; To any ASE mechanic reading the last post, I apologize if you were insulted by the comments posted in the other thread. That was not my intent or doing.

I recall seeing credentials from Ford labeling some of the mechanicsI talked with on the walls around the service area. While I did not go through each and every mechanics training/ability records, none the less there were at least 4 involved with the conversation that offered their opinion. Again, they all agreed that using Fords recommended oil is best. In answereing my question as to if I would do any damage to my engine with installed 5w-30 Mobil 1 Gold, they responded with no. This was all I wanted to verify. They stated they would not go with any higher viscosity, and should switch back to 5w-20 at the next oil change, as this is what Ford recommends.

Simply put, I was told that I would cause no harm/damage with using 5w-30 in my 2011 Mustang V6.

Not meaning spreading any rumors, not recommending anyone change their thinking. Only wanted to state that I'm not doing any damage to my Mustang, according to those who I feel were qualified to answer my direct question.

I always thought the function of a forum was to question, share, and identify problems or observations. When opinions differ, it is up to those who participate to gather information, and render their own decision. I'm indeed no expert; I'm not certified in any shape or form. For that reason, I posted my comments and observations. I asked who I figured would tell me what I needed to know and shared my findings. What I find confusing is when my comments differ from others, it got the thread closed.

In closing, I agree that the best bet is to follow the recommendations of Ford.

 

wow.. why do you do not get it.. its not good for the motor and you could be harming the motor in your car. Its not a debate. Car engines today have to be looked at as a whole and the engineers that build them know what they are doing. They put thousands of hours in to ever single little thing. So I am sure that some guy that works at the dealer or in a repair shop is not up on the whats and whys.

 

Its for the simple reason that they are mechanics, not engine engineers.

They can read a shop manual, and turn wrenches, and follow instructions.



They have LITERALLY NO IDEA how a different oil weight will affect the variable valve timing. They didn't design it, and i can guarantee you 95% of them have absolutely no idea how it works.

How you can take the word of some mechanic over the engineering team behind the engine is baffling to me. It just seems foolish.

 

agree

 

What is your reasoning with wanting to use a different oil?

 

Cause the oil gods say it extends your engine life!

 

I want to use corn oil, so what's the problem with that? LOL

 

Apparently I don't get it. Before I knew about the engine being equipped with TiVCT, I figured my driving 1000 miles a week at an average highway speed of 80 MPH justified a slightly higher oil viscosity, hence my reason for switching to 5w-30. After all the debat on the last two threads, I was concerned with this, so I stopped and asked the "certified" Ford mechanics if I would do damage to my engine by leaving the 5w-30. They said no. They also said to switch back to 5w-20 when the next oil change is due. I left feeling comfortable with that answer.

So, I plan to leave the 5w-30 full synthetic in it for another 2k miles (I already have 2k on it now, WITH NO ILL EFFECTS).

So, I will switch back, but when it's due for it's next oil change. Like I said, the engine is running perfectly with the 5w-30, and I was told I would do no harm to the TiVCT. I feel comfortable accepting that answer from the service department over that of what I'm getting here. No offence, but only one member here has indicated his credentials as a Ford Certified mechanic; everyone else is specifying Ford design engineers, yet I have not seen any documented proof that a higher viscosity oil will damage the TiVCT.
If you were in my position, whom do you trust? If I had documented proof that the 5w-30 was doing damage to my engine, believe me, I'd be dumping it right now. But after 2K on it's current oil, it's running purfectly, the MPG is still at 24.6 (which is where it has been since I've bought it and driven this same route to work over 4 months now).

Yes, I get it. Ford recommends 5w-20, and I'll go back to this. Until the next oil change though, the current oil will remain, unless I get some sort of documented proof that the 5w-30 is causing damage.

 

thats the thing about engine damage.. you wont know for a while. No one here said it would cause instant failure. I am sure my car would run on 110 race gas but I am also sure it wouldnt do so for 60k miles.

 

Again, I simply ask....just show me documented proof that states running 5w-30 is going to do damage to my engine that's equipped with TiVCT. That's a simple request. I already have documented proof that Ford recommends 5w-20; it's on my oil cap, and it's in my owners manual. But I have not seen any proof that 5w-30 will damage my engine, either now, or in 60K miles from now.

If I'm shown this, I will drain it immediately, and thank the person that brought it to my attention.

 

. Its the long term damage you have to worry about

 

There is also no documented proof that 15w-40 diesel oil will not harm your engine. You should try that oil next change

 

+1000000 he sure should

 

They do not have proof because they did not think they would have to do studies on everything that would not work in the motor. I am sure they do not have any paperwork saying crisco will not work. That must mean it will work. Its this kind of thinking that leads people to sue mcdonalds for not putting warning labels on hot coffee.


You really do not think they would run the more common 5w30 instead of
5w20 if they could?

 

We can come up with stupid examples all day; throw **** in the oil pan....

I'm using a valid SAE rated oil oil (not diesel) rated for gasoline engines.