So my engine has been working fine, i have a oil leak that can be maintained by stoppers and more oil, but now my engine sounds "weak" and makes a high pitched whirring noise. The engine is also sounding a bit eradicate. Kinda relatable to a heart defect or something. This happened so suddenly without much warning.
I have a 98 Ford Ranger with a remade V4 engine in it.
I know nothing about cars and hope someone can help me at least a little, and maybe tell me what it might cost if you know the possible problem.
Thank you
Added (1). Stoppers. They are thicker oil or something to help stop leaks.
Added (2). And also, by remade engine, i meant refurbished. I just couldn't remember the word for it earlier.