Originally Posted by GunsOfNavarone
I have read really good things about the Mobil 1 filter; also heard it is the same internal parts as the K&N filter, just doesn't have the outside break nut welded to the outside of the case.
I only use 4.3L filters in my 3.8L Bonneville. I like the extra capacity of the filter, the factory 3,8l filter is very small. The 4.3L filter when used in a 3.8L bonneville extends about 1/2 past the oil pan, so it is subject to damage if is you run over something. I think that happening is very unlikely- but that is why GM uses the smaller filter in the 3.8l.
It has a good metal core and my oil doesn't come out completely black at the 3k change, so it performs well (this is with conventional btw).
I think I always used the filter for the Lumina Z34 on my 3800. It was also an extended capacity compared to the stock 3.8 filter. I also use an extended filter on the Fiero, but the fact that the filter sticks out sideways from the block means no risk of scraping off the ground lol.