[derekderek]

09 335i. N54 80k. jnjectors done by BMW in 2017 they say 11 on them.so i assume index 11. are they equal to a 12? if 9 years old and 28k miles can i consider them still good? are these injectors rebuildable? or clean-test and throw away if bad? who is a good injector guy to talk to? thanks.

[whyzee125]

Yes, those are index 11 and they're not the same as 12 but they seem to be equally reliable.

These are not rebuildable despite what some unscrupulous sellers on eBay, etc. say.

They can be ultrasonically cleaned and some call this "refurbished" but ultimately nothing inside can be replaced.

You can check if yours are leaking like this:

It would be a decent idea to run a bottle of Techron through them every once in a while but they could very well still be working just fine even at that age.

[oVeRdOsE.]

i read the same, index11 or 12 are very good (well ''good'' for an N54). (of course 12 should be better, since it's a revision).

If they dont leak, generally they are good. I know people still running index1

I have index 5, all good.