To me it sounds like everyone has had the engine up to operating temp, then prelubed the plugs for removal, after removal cleaned the bore and added neversieze to the plugs before installation and have alot of time and patience. Sounds like thats what I need to do so I dont break and gp's.
Thanks for all the good advice and tips.

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'85 F250 6.9L diesel 2wd XL XC LB Centurion, Gone
'95 Mercedes E 300 Diesel W124.131 with a OM606.910 and just over 200k on the clock, needs top end engine work and a transmission.
2000 S500 W220 with a 5.0L V8 gas power.