mobil 1 extended drains

[twigdog]

Well, not to through a monkey wrench into my own post, but I just found true green GC 0w-30 and BC 5w-40 for the first time in my area. The GC was the green mo4 bottle so I bought some. Any reason these wouldn't be just as capable as the Mobil 1s?

 

[surfstar]

Some UOAs have shown the TBN of GC to be depleted earlier than 10-15k mile drains. It will depend on the engine, though.