[ViewsOfTheVI]

Hey gang, new-ish owner of a 435i xDrive, im at 120k and that’s quite high so im wondering what should be or should have been replaced by now. I see that im leaking a bit of oil from some tube that goes through my valve cover, not sure would someone be able to help me with the name of it? I’m going to replace the water pump/thermostat and am ordering off FCP from Canada, might as well get a bunch of other stuff as well. Would appreciate any help, thanks team

[F32Fleet]

I would star looking at the coolant hoses which attach to the thermostat/water pump. Specifically the hose leading from the front of the engine to the thermostat. This hose it attached to the front of the engine with a plastic flange. Just replace with a dealer part. You can buy a metal flange and break the flange on a new hose but that'll double your expense for a part which will last 100k miles.

Coolant expansion tank. Inspect it and thin coolant hose which runs from it across the front of the engine bay into the radiator
ATF fluid (pan drop) if not already done.
Front xfr case fluid,
Rear diff.

[ViewsOfTheVI]

Thank you for the help!

[lens]

If you've done your coolant/brake fluid flushes regularly, I'd just replace the hoses and keep the thermostat and waterpump on the side.

My 335i had 286,000km on factory water pump and it's still going without an issue, I've replaced my coolant hoses twice, and thermostat once.

[BRK]

Basic maintenance.
Spark plugs if not already done. You will need a very thin wall plug socket if dyi and the rear plug is a challenge - so knuckle joint sockets and a few extensions in 3/8 or even 1/4 drive tools needed. (Plus patience - generally not a thing that is off the shelf...)
Inspect drive belt for cracks and replace if they are apparent.
I also did the diff oil on my 428i at 105,00 kms because its not hard for dyi and the oil is cheap. The "lifetime" fluid debate has been done many times - its a personal choice imo.

[ooshnoo]

New spark plugs and coils
New drive belt and tensioner
New transmission fluid and pan/filter
New differential fluid
New transfer case fluid (if Xdrive)
Check valve cover and oil filter housing gaskets for leaks
Oil change with engine flush
5000 mile oil changes thereafter

[cfm56d7b]

Originally Posted by ooshnoo

New spark plugs and coils
New drive belt and tensioner
New transmission fluid and pan/filter
New differential fluid
New transfer case fluid (if Xdrive)
Check valve cover and oil filter housing gaskets for leaks
Oil change with engine flush
5000 mile oil changes thereafter

Adding to the nice list:

- Charge pipe; replace it if you plan to keep the car. Suggest Evolution Racewerks as a top candidate (not a commercial endorsement; just experience)

- Suspension; replace all items with rubber components

[ViewsOfTheVI]

You guys are amazing!

[ADHD]

any suggestions on the belt and tensioner? Is the INA product same as OEM. ive read a few different opinions. Seen a Gates kit as well for 80$ on amazon.

[scubajim]

I used a few INA products on my E39 sometime listed as OE. No issues.

[thatgarrett]

I used the INA kit (with a continental belt) that FCP Euro sells last year and it’s been great, looks just like the one I took off, seems high quality