I recently changed the gasket on my differential and ever since I have had a leak from the vent. I removed the vent, cleaned and replaced it with the arrow pointing to the rear for the car. The Royal Purple 75W90 gear lube is level with the bottom of the filler plug with the car sitting on the ground.

There is definitely oil coming out the top of the vent after just a few miles of normal driving. Anyone else had this issue?

Ya all the 240Z I own let some oil out the breather. Well the last one didn't till I found it under the road grime and cleaned it off, so it wasn't really a breather till I cleaned it I guess. It is made of two part the part the screws in and a cylinder shaped cap, you have the cap. Did you take pictures, maybe you have more spill out than expected???

Steve-does the amount of oil you put in to reach the bottom of the fill hole jive with what the FSM calls for?

Steve-does the amount of oil you put in to reach the bottom of the fill hole jive with what the FSM calls for?

FSM calls for 1 quart. I was only able to get about 90% of that in before it started dribbling out.

It is made of two part the part the screws in and a cylinder shaped cap, you have the cap. Did you take pictures, maybe you have more spill out than expected???

I have both the vent and cap and both look to be in good condition. I created a dime size oil spot on the floor after I drove it the first time. That seems like a lot.

Well the day after I raced my first Z I'd find about a dime under the car

Well the day after I raced my first Z I'd find about a dime under the car

I guess if the wind blows the oil around a bit back there it can be a form of rust protection.

That's about right it goes directly into the main part of the diff without a baffle valve, just a cap. I'm just glad the rack don't do that, and the engine, and transmision

Good that makes it easy. When my wife stops complaining about the smell of gear oil in the garage its time to fill up the diff.:classic:

There is a thread somewhere around here for a fix that goes into more detail but here is the basics. Take the inspection plate off. Take the breather off and tap the hole. Put a fitting in there that will thread in and hook a hose to the other side of the fitting. Run the hose up and zip tie it to something. On the end of the hose put a little filter that would normally go on a valve cover.

Good that makes it easy. When my wife stops complaining about the smell of gear oil in the garage its time to fill up the diff.:classic:

That's the attitude whats a little color on the floor, and the manly smell of gear oil.

That's the attitude whats a little color on the floor, and the manly smell of gear oil.

Good thing I went with royal purple. Adds an artistic splash of color to an otherwise dull concrete slab