Bimmerfest - BMW Forums - View Single Post - signs of F30 N20/N26 timing chain issue, and OCI to the rescue?
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Old 04-23-2017, 12:04 PM
namelessman namelessman is offline
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Location: northern california
Join Date: Dec 2004
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Most of the M54 and M62 engines are way past 100k these days, so those are good reference in regard to engine longevity.

The M54/M62 timing chain guides are plastic too, but the chains(at least M62 ons) look massive compared to N20/N26. There is online DIY's on M62 saying that the guides broke but the chains held everything together until replacement, without causing engine seizure. In those cases noisy engines are also tell-tale signs.

It is a bit early to tell if N52 carries on the tradition or not.

The game plan for owners probably will be to keep listening for high-pitch whines as shown in links of post#1, and shorten OCI to 8k-ish miles. BMWNA can reprogram the OCI on pre-2014 to 10k/1-yr, but for some reason the service refused to do it.

My car currently has LL01FE 0w30, the engine sounds quieter than with LL01 5w30, and gas mileage does improve 5%-ish. In contrast Mobil1 FS 0w40 is no longer LL-01, and the old school 0w40 has not been really tested for N20/N26 anyway.
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