Hello all, Long time reader, first time poster. For several years now my 2004 Passat with the ATQ V6 has been treated to a steady diet of GC 0w30. Early on, I tried Mobil 1 0w40 and I found that my cam chain tensioners got rather noisy partway through the OCI. I started using GC 0w30 based largely on what I read here on BITOG, and I've been completely happy with it. I had the valve covers off doing maintenance last fall and things looked VERY good for a motor with 140K on the clock. However, changes have come... 1) It seems Castrol has recently changed up their packaging, and I'm not sure what that means for their formula. I'm sure it's on here somewhere, but the GC thread is almost 60 pages long let alone the rest of the forum. 2) While searching for a car for my daughter, I stumbled across a little something for Dad. Daughter gets the Passat! I'm coming up on the first OCI for this beast (13 qts!) and so I'm revisiting my selection of VW 502.00 oils for my growing fleet. I've read here over the last couple days that M1 0w40 is highly regarded, but some years ago it was known for quickly shearing (depending on application). Have there been major changes in the last five years or so? Are there any other oils you'd recommend? The W12 has a 10,000 mile OCI and I plan to drive it till the wheels fall off, so I'm willing to consider some of the boutique oils if there's a good reason. Bear in mind it has a huge sump capacity and a long OCI, and does not use direct injection or forced induction.