I've had my 330i for 3 months, during cold temperatures (as low as 10 degrees F.). I have never heard any valve noise, or "rattly and spitty" sounds coming from my 3.0L. Also, I don't think the 3-series engines have Valvetronic, although they do have Double VANOS. I just recently read that the new E90 3.0L will have Valvetronic.
Originally Posted by andy_thomas
I'll second Artslinger - for the first few minutes in cold weather, the engine note is very rattly and spitty. My engine has a lot of valvetrain noise anyway (it's a Valvetronic) but this is noticeably louder than normal, warmed-up operation.
Bimmerfest Supporting Member
2011 535i AT | Black Sapphire/Cinnamon | Premium | Heated Sts | Nav | Sirius | Anthracite Hdr & Trim
Prior: 2008 335i 6MT Sedan | Black Sapphire/Terra Leather | Premium | Cold | CA | OEM Alarm
Prior: 2005 330i 6MT | Black Sapphire/Sand Leather | Premium | Cold | UGO | OEM Alarm