I am planning to change the belt tensioner and belt on my 300D within the next week or so, and think I have all my ducks in a row other than the Omnifit 100 Orange sealant listed in the FSM. I've seen some people say they used blue threadlocker, and others red. In sixto's DIY (which is a huge help, thanks!) it says Locktite 271. 1) Is Permatex 27140 interchangeable? All the cross-references I find list Permatex 27100, but not 27140 specifically. 2) The product info on Locktite 271 or Permatex 27100 says it can't be removed unless heated to 500 degrees F??? What if I need to get the bolt out again someday? Would blue maybe be better? Obviously I don't want it to leak or fall out, but I don't want to end up with something I can't remove for the next repair.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

blue threadlock is what you need and a torque wrench.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Thanks! That's also what the dealer parts guys recommended. I do have a torque wrench and will use it ... I'm very paranoid about undertightening OR overtightening ... the latter especially because I read this thread: http://www.peachparts.com/shopforum/diesel-discussion/109058-om603-freak-failure-timing-cover.html ... and have an engine # in the 7,000s (early).

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

then you also might want to clean the threads before sealing it.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)