Talk:Mercedes-Benz M260/M264 engine
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Leaking valve heads global issue
[edit]M260/M264 engine has a hidden defect in valve heads. Problem is in the leaking exhaust valve seats creating misfires. Mercedes Canada already issued a warranty extension ECR-M0002-22-010. This issue is lately discussed over multiple boards since MB in Europe does not provide any support outside warranty.
Sources:
https://www.reddit.com/r/mercedes_benz/comments/104lgvl/so_the_early_m260264_engines_have_had_some/
https://www.aclassclub.co.uk/threads/amg-a35-new-cylinder-head-please.19533/page-10
https://www.motor-talk.de/forum/zylinderkopfschaeden-bei-m260-motoren-t7450564.html