I did replace one glow plug. Tested the plugs on the first three I did and they were good did a compression check, reamed them and put the plugs back in. I forgot that I didn`t ckeck the 4th one. I did a compression check and installed a new plug that I ordered.So that glow plug was probably bad. I got the reamer for about $20 with the glow plugs, but from what I read those aren`t the best glow plugs probably why the reamer was so cheap ,Monarch. I`ve still got the 5th cylinder to do.Had my knee scoped so I can`t do a whole lot at once yet.So far the compression has been pretty good 280 was the worst in the #4 the one with the bad plug.All the rest right around 350.I guess it`s not so good that the numbers are not close to the same. Can someone explain a little more on why the compression #`s should be with in 30 lbs I think it is. Thank`s Rick

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81 240D 116,000 mi. motor, car 283,000 81 300D 155,000 81 300 unknown 81 300SD 221,000