You don’t need to be a Nobel Laureate to know that E46 M3’s have a few issues. Let’s see, there’s Vanos, rod bearings, and cracked subframes to name a few. But when these cars work, oh man are they the bestest. I wrote that last sentence like a twelve-year-old, because that’s what an E46 M3 does to me; They make me feel like a kid again. I get all giddy inside and all I want to do is put my hands all over it and go fast. It’s one of the car fountains of youth. I’ll own one someday.
It was yesterday, however, when my friend on the other side of the country set about to take up a mountainous task: Changing an E46 M3’s rod bearings. It’s not his own car, but a friend’s. He used his own as a guinea pig to rather good success, as so he told. And now he’s applying his talents to another specimen. Hope he’s getting somewhat compensated for his journey to Mordor…But, this article isn’t about rod bearings though.
So I’m at work when he sends me the photo above. The caption? “This was in Harper’s oil pan…” Yikes. Doing the rod bearings does require dropping the oil pan. Normally, you should only have oil in there, not metal parts. These look like 9mm bullet casings though. What could they be from? My friend has pointed to the Vanos system for fault. The car in question was bought with the prior owner stating that the Vanos had been replaced. Why was it replaced? Likely because it exploded, made obvious by the loose gaggle of parts. But, they didn’t fish out the parts that grenaded, just put new in. What are those metal pieces exactly? Could be a roller bearing in the oil pump or drive disc.
Either way, the amazing thing is that the car is fine. Who knows how long this debris has been in the pan. A win on BMW’s part for putting a shield in the pan to prevent the oil pump from sucking it up and distributing throughout the engine. That would’ve made things go bang.
I’m not saying everyone should drop their oil pans just to see if they have metal bits in there. Or you could drop your oil pan and find a gold Rolex. But maybe use it as a buying lesson. The prior owner DIY’d the Vanos, so when buying an E46 M3, make sure you really trust them as a mechanic. If the owner says he did “everything himself” but acts like a clown school dropout, maybe it’s best to walk away. The M3 in question though, it’s not giving up that easily!