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Merz ml 320 bad connecting rod?

can merz [dealer]- know if i have bad rod ?? and would a engine oil change/ brand cause such a problem. 5-30 wt… with 140k

If the tag is right, and you don’t change the oil regularly, then yes, you can expect a rod knock with 140K on the clock. And yes, any experienced mechanic can recognize a rod knock almost instantly. After experiencing 3 within the first year as a mechanic, I know instantly when I hear one.

I also doubt that 5W-30 is the recommended oil for that vehicle.