The most common cause of this is a head gasket issue. So, this is where we need to start.
Here is a guide that will show how to do this test:
https://www.2carpros.com/articles/head-gasket-blown-test
Once we confirm that the head gasket is leaking then we need to try and narrow it down to one bank so that you don't have to do both. This normally will show up in a compression check. Here is a guide that will help with this:
https://www.2carpros.com/articles/how-to-test-engine-compression
Below you will find the process on the left side head as the right is basically the same. Please run through this material and let us know if you have other questions. Thanks
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Monday, October 4th, 2021 AT 2:23 PM