I have a 2008 coupe 3.0si sport with 30K miles, have owned it 11 months, got the dreaded ticking (coincidentally as mentioned earlier in this topic) 2 days after having inspection and oil service by same dealer. They immediately took it back, kept it over night, confirmed the ticking noise and yesterday replaced all valve lifters. Thankfully with one month warranty left, the 2 grand bill is covered by BMW themselves. However, they made no mention of the modified cylinder head with the non - return valve mentioned at the start of this post. Should I have pushed for this, or will replacement of the lifters be enough? I assume that whatever caused the problem with the original lifters can cause the same problem with the new set, to me they have replaced the worn parts without addressing the cause of the wear.
Surely, if there is a modified head it should be fitted. The dealer did go thro the PUMA process.