My engine oil is muddy and I saw white smoke?

Head Gasket Repair:

Labor: $1,000-$2,000 (depends on local labor rates and the complexity of the repair).
Parts: $200-$400 for a head gasket kit.
Total: $1,200-$2,400.

This guide can help as well:

https://www.2carpros.com/articles/recognizing-the-symptoms-understanding-a-blown-head-gasket-in-your-vehicle

Let us know if you need anything else.