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I've been keeping a close "ear" on my timing chain, and soon I'll measure it for stretch. The local dealer FREAKS if you exceed 160K-kms (100K-mi) and tells you that you are about to completely destroy your engine.
My indie starts getting serious about checking them at 200K-kms and above and usually replaces them at 250K (~150K-miles) or so "just to be safe."
The M111 uses a double roller chain and has a nice short path, so they do last a looong time. Give them a nice bath of Mobil 1 changed with reasonable frequency, and the timing chain should last.
M103's also have a nice short path, but they do have a single row chain and should be changed with greater frequency. My mechanic advises that the M103 chains get done at about 180-200K-kms.
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