ACDelco FC219 - Oil Cap Tech. Bulletin

[CapitalTruck]

So, there's a tech bulletin out that advises that when it gets really cold, I mean, cold cold, there is a tendency for the PCV system to freeze up and cause high crankcase pressure that blows oil out of seals, etc. The solution is to put on a vented cap, FC219, to allow the pressure to vent if necessary. It's a cap that has a coil spring pressure relief valve to vent if it gets above a set point. I picked it up to put it on, even though I'm only in the mid-Atlantic region and it doesn't get too cold. My thinking is, if there is a problem with one of the crankcase vent systems, I'm covered. It's never a good thing to have too much pressure, might as well put on a safety valve. It fits perfectly.

[GLSierra13]

Do you know to what year trucks/motors this bulletin applies?

[CapitalTruck]

I feel like it is pretty much all of the LS engines. Certainly the 4.8/5.3 Wouldn't surprise me if not the 4.3 also.