How To Guide Gearbox oil change

Southernboy

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So, here's the "easy" way to do an oil change for the gearbox.
I'll assume you have the required 3 x 500ml transmission oil of the correct type etc.
One thing you will need is 1,5 metres of 10mm plastic tube. easy enough to find in a pet shop that does fish / aquariums etc.
Other things - 17mm socket wrench, a good rag to wipe up any mess and your hands.
10mm drill bit and drill.

1. Jack up and drain the old oil. Clean magnetic plug and around the threads etc on the gearbox. Best done with the gearbox oil at running temp. Leave it raining with the car lowered to a level / floor position.
2. Remove the lid from one of the 500ml bottles and also the plastic tube thingy which extends out. A slight tug will pull it out the bottle completely.
3. Use a 10mm drill bit and drill to drill a 10mm hole to one side of the center of the bottle cap. Don't go too close to the edge where the cap threads are.
4. The plastic tube you removed from the bottle has a flange at one end. The flange must be on the inside of the bottle cap. You will also notice a small 2mm hole in the side of the tube aprox 15mm above the flange. You will need to keep that little hole visual when filling so you can close / open it with your thumb or finger.
4. Pull out the leather gearshift gaiter plastic clip in thingy on the console. (You don't have to remove the gearknob or the gaiter). Below the gaiter is a thick rubber sound proofinng lump - just lift it up as far as you can.
Below that, there's a large rubber clip in grommet which seals the gearshift lever shaft as it passes through to the gearbox. The grommet has a rim on the underside of the car metal tunnel of about 20mm wide. Only pull the grommet out of it's hole on the right hand side and only about 180 degrees. Don't need to pull it out completely The refill plug on the gearbox is on the right hand side of the box and aprox 500 - 600mm towards the front of the car from where the shift lever is.
Feed the 10mm plastic tube down and forward to the front of the car through the gap you have once the grommet is out the way. Push about 600mm of tube through.
5. Raise the car again - the old oil should be well drained. Replace and tighten the drain plug. Remove the filler plug on the side of the box and find your plastic pipe and feed it over the gearbox mounting and into the filler hole until the end of the pipe is stopped by whatever is in the box that stops it - (aprox 100mm).
6. Lower the car with the waste oil collection pan under the filler plug area. Withe the plastic extension pipe pushed through the bottle cap, push the other end into the open end of the tube which will comfortably extend outside the car and allow you to complete the job easily standing up at the driver door. Get the first bottle of oil - the one that sacrificed it's plastic extension now fitted through the cap and screw the modified cap onto the bottle.
7 Remember that small hole !! You can turn the plastic extension so you can see it with the bottle of oil now inverted to send the oil down the tube - seal the hole with your thumb and squeeze the plastic bottle to force oil down the tube - to allow air back into the now slightly crushed bottle simply lift your finger off that small hole. Repeat the process until all the oil is sent down the tube to the box. Remove the modified cap and fit to the next bottle after removing the plastic extension from the new bottle.
Squeeze all the oil from the second 500ml bottle down the tube as you did with the first. Repeat for the third 500ml bottle as for the other two. Don't worry about the limit of 1.3 litres of oil or trying to guess the 300 ml from the last bottle. The oil will simply spill over into your waste collection tray under the car once the level gets to the filler hole.
8. detach the last bottle from the tube and remove the modified cap from the tube. Get your clean up rag and wipe the end of the tube plus 300mm on the outside. Allow the 1/4 light window to hold it up high by closing the door so it pinches the tube between the window frame and the screen A pillar.
Raise the car and with your rag in hand remove the tube from the filler hole and allow it to hang into your waste collection pan. Refit the filler plug and tighten to spec. By this time most of any residual oil in the tube will have emptied into your waste pan, but it won't be totally devoid of oil. Open the car door to release the tube at the top, and pull the tube from out from inside the car. Be ready to cover the end of the tube with your rag as it clears the rubber gearshift grommet and comes into the car. There may be a drop of oil hanging onto it's tip.
9. refit the rubber grommet, gearshift gaiter etc and compliment yourself on how bloody easy it is to do a transmission oil change.. :thumbsup:
 

brittas

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Mar 3, 2019
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Hmm that could be one for my local garage . I guess my gear box oil is probably 21years old.
 

t-tony

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Normal garden hose pipe will do the job, also to refill the diff. oil too, over the N/S/R wheel to the diff. Ask me how I know.:)

IMG_20200125_115102153.jpg


Tony.
 
Last edited:

colb

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Newport, South Wales,UK
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Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
I use the same method with a length of tube connected to a funnel, the tube is threaded down through the engine bay and into the filler hole, always helps to warm the oil bottles to thin the oil by dunking them in hot water for a time before pouring them into the gearbox. Easy enough on the 1.9 to thread it down through the engine bay may be harder on the 6 pot cars. Before starting the job the first thing you need to do is ensure the filler plug can be removed, its probably been in there for many years and may be quite tight. No good draining the oil only to find out the filler plug can't be undone. Same for changing the diff oil make sure the filler plug comes out.
 

2DunnsZ3

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American Zeds
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getting ready to do all my oils.. engine, diff, and gearbox. just because I cant find record of the last two ever being done.
 

Southernboy

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An interesting conversation with a BMW mechanic yesterday - " Lifetime Oil" as put forward by BMW refers to the Lifetime of the warranty given by the oil supplier and / or the warranty on the components. ( engine / gearbox etc etc)
 

Silver Baz

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Wirral
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Z3 2.0L Roadster
An interesting conversation with a BMW mechanic yesterday - " Lifetime Oil" as put forward by BMW refers to the Lifetime of the warranty given by the oil supplier and / or the warranty on the components. ( engine / gearbox etc etc)
Just read this in my workshop manual :


RECOMMENDED FLUID For model years 1998-2003, all manual transmissions are filled with Esso/Exxon MTFLT1 lifetime fluid. A Yellow label with the letters MTFLT1 is located next to the oil filler plug. Except for models specified under SERVICE INTERVALS, no oil change is required for the service life of the transmission.
 

Pingu

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Just read this in my workshop manual :


RECOMMENDED FLUID For model years 1998-2003, all manual transmissions are filled with Esso/Exxon MTFLT1 lifetime fluid. A Yellow label with the letters MTFLT1 is located next to the oil filler plug. Except for models specified under SERVICE INTERVALS, no oil change is required for the service life of the transmission.
BMW "lifetime" is around 10 years or 100,000 miles.

MTF-1 gearbox oil is available from BMW (service department), but you have to supply your own container.
 

t-tony

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No not the same. Gearbox uses ATF type oil and Diff. uses proper gear oil (stinks like hell - well the old oil does when you drain it)

Tony.
 

Silver Baz

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Did the engine oil Friday plus air filter and had a look where the gearbox plugs where , I'll go to Halfords tomorrow and get a pump and some gearbox oil . I'll check out the diff. accessibility for the next job .
 

t-tony

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Don't waste money on a pump you won't use much. This is all you need to re fill the gearbox and the diff. on a Z3.
20200126_112820.jpg

A small funnel and 1 metre garden hose.

Tony.
 

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Silver Baz

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A small funnel and 1 metre garden hose.
I read that earlier in the thread , I couldn't believe the fill hole was that big . I've got plenty of the hose knocking about and probably a funnel .
 

Silver Baz

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Already for the oil (coming tomorrow), garden hose and funnel in place , drain plug re-inserted ;)
 

t-tony

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Already for the oil (coming tomorrow), garden hose and funnel in place , drain plug re-inserted ;)
You still need your drain tray (not like the one @Grumps used;)) as when you get to the level you'll still have a bit left in the tube. From Saturday I can tell you after 1 full litre it takes very little to get up to level.

Tony.
 
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