When I reamed the holes on my 84 300SD and had trouble getting the reamer in. It had 250K on the engine and I have no idea if previous owners had ever cleaned the holes. I bought a reamer and I'll run it in the holes every time I pull the glow plugs.

Imo, you're rolling the dice by not reaming those holes. If you care for your injector system properly renting a reamer from a member here may be the right way for you to go. I have no idea how often reaming holes needs to be done. I just know that I'm never going to have issues getting plugs out or putting them back in.

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84 300SD
85 380SE
83 528e
95 318ic

Use of the vehicle is definitely another factor.
If the car gets long distances at higher speeds, like my 240/300 cars do-- probably not an issue.


Each one of my cars gets at least one 1000 mile trip per month, except the HMMWV engine in the truck, but that one gets periodic multi-thousand mile trips.


I worry more about carbon buildup in the gassers that are not used so much, or the 1950 170D

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Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6