While getting a new headgasket for my C36 engine, my "new" tech said that some of the valve-guides on the C36 M104 AMG engine are loose.

Do I replace *ALL* of them, or just the problem ones?

Also, when you replace the valve guides, do you have to re-surface/cut the respective valves and valve-seats so you have a good seal again?

My thought is that when replacing the valve-guides, you can't get the valve exactly positioned and seated where it was previously, so you need to re- surface/cut the valves & valve-seats for a perfect fit/seat/seal.

Also, anything else I should check or replace while doing the head-gasket?

Thanks in advance,

:-) neil
1988 360TE AMG
1993 500E