Hi all. We’ve had our LR4 for about two years now. I had a problem with an oil leak that I was trying to track down, and then we would get intermittent HUGE plumes of smoke. Particularly when going down a steep hill, but other wise it would never happen.

I saw a bunch of different references to the vacuum pump leak somehow sucking oil into the exhaust.

I have no idea how this is possible.

Is there any truth to this? I guess I’m looking for a “oh yeah that’s a known issue!” or “he fell for the vacuum pump story.”

Thanks. And yes I just replaced it.