Coolant and oil mixed.

You are correct that it is going to be near the oil filter. Basically, it is on the oil filter housing if it is equipped.

It is not clear on the 5.4L if it has the cooler but if you look at the oil filter housing and it has two lines running from it then that is the cooler.

Here is a guide that will help with changing the oil if others that visit this post need that info as well:

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

I attached a picture below of what it will look like so please run through this and let us know if you need other info.

Here are some guides that help with this issue.

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Thanks

Hey thanks for this info. anyways, I checked and there is no oil cooler on there. so, does that mean the oil in the coolant reservoir is from a blown head gasket?

Understood.

On this engine that would be the most likely cause of this.

Here are a couple guides that will help with this type of testing:

https://www.2carpros.com/articles/head-gasket-blown-test

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Let us know what you find with the head gasket tests and we can go from there.

Thanks

thanks, I will look into this.

Sounds great. Let us know how it turns out. Thanks