[lowrydr310]

I need a few new injectors on my 335, and I'm wondering if I should replace the valve cover while I have the injectors and hard fuel lines off, one of those 'while you're in there' jobs.

There are no symptoms of a cracked valve cover or leaky gasket. When I bought the car over a year ago there was some oily grime built up around the metal tray/ledge above the exhaust manifolds that looked like a leaky VCG but I wiped it clean and it's stayed clean ever since. I think that was spillage from an oil top off by the previous owner.

There aren't really any signs of excessive oil consumption or a malfunctioning PCV system. I have to add a quart after 4000 miles (mostly city driving and lots of aggressive acceleration) which seems normal.

I'm just unsure of replacing or not since there are no leaks. Cover appears original to the car from 2007, with 170K miles on it.

[Mgh024]

I would imagine it’s had at least one head cover gasket replacement since 2007…

Do you have any history of the car?

If it’s original, I would probably suggest changing it. That said, they tend to develop a slow leak, and over time grows bigger, giving you ample time to replace it before things get bad.

If you don’t have the history, it could need a change in 1000 miles, or 75000 miles…

[whyzee125]

IMO if it’s not leaking, leave it alone. I agree, it’s almost certainly been done once before (the gasket) but it’s a way bigger pain than injectors and the two can both be done independently so I say just leave it.

FWIW, my previous 07 was still on the OG gasket and cover at 166k so it is possible though this was almost 10 years ago. I bought the full cover but ended up just using the gasket and selling the cover as mine looked perfect. Never cracked or anything.

[E93Dude]

Nah, I’d go ahead and replace the gasket. Maybe it has been replaced already. Maybe it hasnt. You just dont know. Mine failed at 91,000, while others have gone north of 150,000 with nary an errant drop of oil. If you are already taking off the fuel lines and injectors, replacing the gasket requires very little extra work, and also gives you a chance to see how clean the motor is on the inside (and by extension whether or not it had regular oil changes). That might be informative for you to know.

I’m not really in favor of pre-emptively replacing functioning expensive things just because they have a lot of miles or years, but the gasket is cheap, easy to get at if you are already in there, and it will fail at some point.

[StradaRedlands]

If you decide to do it, I believe Rock Auto carrying Elring to be the best non BMW option out there. At least for the N52 VC.