[NJ 1161]

Got my 335d out of the garage for the first time in a week and a half and i found a puddle of light brown oil, 8" x 3" on the garage floor. It was approx below the drivers seat but in the centre of the car but offset towards the drivers side (uk rhd). Any ideas before it goes to the garage??

Gearbox??

No leaks previously seen??

[Mart1000]

Try parking it up on a kerb and shine a torch under there you might be able to see what is wet... I can't help you with what would be there as I've not had mine long.

[NJ 1161]

It was booked at Hemingstones BMW today anyway for something diffrent so i have asked them to look, but just wondering how big a bill?? Or any common faults?? Hopefully a 2p washer that is easy to replace!!

[TDoyley]

Sounds like transmission fluid. Have you got an auto ? Common for transmission oil to leak from sump pan gasket or from a mechanical sleeve as early as 40k miles. Had mine replaced a couple of weeks ago under warranty. Would have cost around £500 at dealers ! Good luck.

[NJ 1161]

BMW hemingstone have tightened something (free of charge, i must add) and seem to think its sorted. Mechanic not there when picked up so unsure at this stage what they exactly did. Will keep eye out, but hopefully not autobox.

[NJ 1161]

Arrgh. Several weeks later and puddle is back. Seems it went for a week or so but has now returned. Guess its back to the garage!!

[Team Green2]

How bigs the puddle could be boost hose

[ALF_E90]

Is it an auto?

Mine leaked a small amount and the gearbox sump and the seal around the wiring loom were both replaced under the AUW (I think they thought it was the latter, they changed it, but it turned out to be the former so I got both done).

This was happening on mine by 3 years/20k. No more since.

[jonl1983]

mines in today for the same problem, needs new oil pan, gasket and few other bits. Waiting on bmw uk to authorise.

Was only replaced 5 months ago

[m1bjr]

Could be the oil return banjo from the turbo/cooler or similar if they tried to 'tighten' something last time.

Sgould be easy, unless the threads are shot....

[NJ 1161]

Originally Posted by m1bjr

Could be the oil return banjo from the turbo/cooler or similar if they tried to 'tighten' something last time.

Sgould be easy, unless the threads are shot....

Where about is this?? Would it result in aleak in the middle of the car? They did the red turbo boost pipe for me a couple of months back. Is this related??

Seemed to stop leaking for a week or so, so either loosened off again, or as you said a thread has gone?

[Team Green2]

Yeah it is the boost hose he is on about have a look at the red tube and see if it's leaking

[NJ 1161]

When the red boost pipe leaked it was a small dark/ black oil puddle near the front. This is a lightish brown patch under the drivers seat? Can the two be connected??

Will run it back up to the garage when get a chance, but still good to have a steer of what to look for

Thought it had been sorted

[NJ 1161]

Originally Posted by TDoyley

Sounds like transmission fluid. Have you got an auto ? Common for transmission oil to leak from sump pan gasket or from a mechanical sleeve as early as 40k miles. Had mine replaced a couple of weeks ago under warranty. Would have cost around £500 at dealers ! Good luck.

If it is this, whats involved in a DIY?? I'm thinking transmission fluid. Wondering if temperature is a factor. Both times its happened its been on a several hundred mile trip then rested up in garage?

[m1bjr]

Slushbox tranny fluid (ATF) is generally but not always red.

I suppose it may be a regular synth oil in there, or its very dirty.
The location might be misleading though. Oil will run around the underbody plastic panels.
You are going to have to get under the car, maybe take the back plastic shield off

To the above, no I was not on about a boost hose.
I'm wondering where the oil drains for the turbos are.
Often a fitting on the side of the sump pan or nearby.
I admit the 335d is not so familiar to me.

Could be a leaky sump plug, oil runs around. Pop the sump cover open and see whats occuring.

[NJ 1161]

[QUOTE=m1bjr;11482463]Slushbox tranny fluid (ATF) is generally but not always red.

thats interesting! FBMWSH history car so should be oem! Maybe not auto box then.

I suppose it may be a regular synth oil in there, or its very dirty.
The location might be misleading though. Oil will run around the underbody plastic panels.
You are going to have to get under the car, maybe take the back plastic shield off -

Think you may be right!!

[m1bjr]

Mm.... looking at others history on this, it may well be tranny fluid as they dont use red.
Someone else might be on the money with the sleeve leaking too (mechatronic)
There is a service kit and its not big money mate.

here:

http://forums.5series.net/topic/9603...smission-leak/

http://www.7machine.com/bmw/53231.html

[TDoyley]

Have a look at this ........

http://www.e90post.com/forums/showthread.php?t=240526

If it's the transmission sump pan you should be able to see signs of seepage around the outer edges of the pan (as per the pictures in the link). The seepage builds up in your under-tray and deposits on your drive in larger puddles. If it's a small amount of seepage you might go weeks or months between noticing anything on your driveway.

Have had this issue with a 530d and very recently with a 335i.

[NJ 1161]

Yup, think it must be sleeve/ sump pan seal.

As descibed always takes a week or so and been sitting for 2 weeks and patch returned and same sizes as described.

If replacing sleeve and seal would people suggest changing all auto trans fluid (110k) or just topping up??