Help about 5w-20, 5w-30, 5w-40 and 5w-50 oil

[GregO]

@MRASPHALTO1
So I’ve listened to your video enough to say that motor is not firing on all 8 cylinders. Actually it sounds a bit like a diesel…….
Time to pull the plugs and do a compression test.
I’m assuming if you took it to have the oil changed you’re probably not going to do your own compression check ?

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[MRASPHALTO1]

Hello; I looked at your member profile and assume it is a 2020 GT. I am sure someone will correct me if i get this wrong. I think the Gen III Coyote has the spray plasma cylinder linings. This makes a rebuild depend on the condition of that lining.
"the noise does tend to disappear when you accelerate, but it comes back when it relanti." - this to me indicates a spun bearing or perhaps just worn too much. Quiter when on the gas then louder when you let off the gas.

To be clear my online guess is far from sure. Lots of moving parts which can make noise. That you will be taking it to a shop is a wise move.
A question= Did the engine make the noise first thing when you first got it or did the noise start some miles after you started driving it???

I have some questions which are not important at this time. Reply or not -your choice.
Can you do mechanical work yourself?
Do you have a place + tools to do such work?
Did you budget for a very expensive job such as a replacement engine?
Can you get parts?

I'm sure I have the ability to do mechanical work, but unfortunately, I don't have the time or the tools, so I have to resort to a mechanic.

Here's the link to the auction post where you can hear the engine sound; it really was loud at this point.

https://bid.cars/en/lot/0-43575609/2020-Ford-Mustang-1FA6P8CF8L5126818

Once I had it, I changed all the spark plugs because the sound you hear in that video sounds like a piston isn't firing. After changing them, it improved quite a bit, but the problem persisted.

In addition, it had problems with both catalytic converters (I imagine that because one or more spark plugs weren't working, gasoline accumulated on the catalytic converters and they started to melt). Today, I replaced both of them with Magnaflows.

I've seen that you can get a used Coyote for between $3,000 and $5,000 USD, at least for the first-generation models, but since I live outside the United States, the price will probably be a bit higher.

I could also install a Coyote from an F-150, and I think that would be a little cheaper, although I also think I'd have to reprogram it.

 

[MRASPHALTO1]

@MRASPHALTO1
So I’ve listened to your video enough to say that motor is not firing on all 8 cylinders. Actually it sounds a bit like a diesel…….
Time to pull the plugs and do a compression test.
I’m assuming if you took it to have the oil changed you’re probably not going to do your own compression check ?

When I received the car, I replaced all the spark plugs, and I remember that when we initially connected the computer, there was an error code for one of the cylinders due to a spark plug issue.

When I connected the computer again today to clear the code related to the catalytic converters I recently installed, no errors related to spark plugs or misfires appeared, which leads me to believe that all 8 cylinders are functioning.

 

[sk47]

I'm sure I have the ability to do mechanical work, but unfortunately, I don't have the time or the tools, so I have to resort to a mechanic.

Here's the link to the auction post where you can hear the engine sound; it really was loud at this point.

https://bid.cars/en/lot/0-43575609/2020-Ford-Mustang-1FA6P8CF8L5126818

Once I had it, I changed all the spark plugs because the sound you hear in that video sounds like a piston isn't firing. After changing them, it improved quite a bit, but the problem persisted.

In addition, it had problems with both catalytic converters (I imagine that because one or more spark plugs weren't working, gasoline accumulated on the catalytic converters and they started to melt). Today, I replaced both of them with Magnaflows.

I've seen that you can get a used Coyote for between $3,000 and $5,000 USD, at least for the first-generation models, but since I live outside the United States, the price will probably be a bit higher.

I could also install a Coyote from an F-150, and I think that would be a little cheaper, although I also think I'd have to reprogram it.

Hello; I looked t the link to the auction. Did not play the video. So, engine had noise when you bought the car. A project car I suppose.

Melted converters can be from running too rich. Non firing cylinders would allow raw fuel into the exhaust.

I do not know about the cost of a Gen III replacement engine. Junkyard I guess???

I have not done a modern engine replacement so cannot say for sure. If you do go that route, try hard to get the full wire harnesses with all the computers and such. My guess is you will have to find a shop which can do extensive programing.

From the pictures it looks that you have a big project. Good luck.

 

[MRASPHALTO1]

Hello; I looked t the link to the auction. Did not play the video. So, engine had noise when you bought the car. A project car I suppose.

Melted converters can be from running too rich. Non firing cylinders would allow raw fuel into the exhaust.

I do not know about the cost of a Gen III replacement engine. Junkyard I guess???

I have not done a modern engine replacement so cannot say for sure. If you do go that route, try hard to get the full wire harnesses with all the computers and such. My guess is you will have to find a shop which can do extensive programing.

From the pictures it looks that you have a big project. Good luck.

For now, all that's left is to remove the dent and paint the affected areas.

I located the previous owner, and he told me he only used the car to go to university. According to him, the car was hit by a semi-truck while he was backing up at his house.

 

[HKusp]

When I received the car, I replaced all the spark plugs, and I remember that when we initially connected the computer, there was an error code for one of the cylinders due to a spark plug issue.

When I connected the computer again today to clear the code related to the catalytic converters I recently installed, no errors related to spark plugs or misfires appeared, which leads me to believe that all 8 cylinders are functioning.

It may be firing, but it sounds (to him) like it is lacking compression. You need to do a static compression test and a leak down test.

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