Engine oil and filter change on the B-Class 180CDI W245

This is the most modern car which I have written an oil change procedure about. What is the difference here compared to the older cars? To be honest not much! The only difference is the car computer needs to be told that an oil change has happened and the service interval be reset through an OBD2 diagnostics unit. The OBD2 diagnostics unit can be found quite cheap online, but make sure you get one that works for this model with the capability to reset service intervals and fault codes. Since the more basic ones can only read fault codes.


Get the necessary parts and oil. Here you need a filter kit, which contains the oil filter element, two rubber gaskets for the filter housing and a new drain plug with a new copper washer. Make sure to not get the cheapest filter you can find, since in my experience the filter element can start to deteriorate if you have long service intervals. This car is rated at 15.000km between oil changes, but I suggest doing them at 10.000km.


  • Oil filter kit
  • Oil: Keep at least 6L on hand- The car needs around 5,4-5,8L


  • Jack and jack stands
  • Sockets
  • Oil drain pan

I tend to use Castrol’s oil picker to find which oil I need for any car, but if you prefer other brands then I have no objection. Anyway Castrol recommends Edge 0W-30, but this could change if you plan to use the car in more extreme weather conditions. Refer to the owners manual if in doubt.

New engine oil for 180CDI
0W-30 Oil for 180CDI


The engine should be at operating temperature to make the draining more effective. So prepare the oil change after a trip, either back from work or after the store.

I’m always a bit shocked when checking the oil on diesels since it’s usually pure black in color after a relatively short time. This car had some time since the last oil change and the level was quite low. This did worry me a bit since the car is at 250.000km already. It is always a good idea to check the bottom of the oil drip pan for sludge and metal shavings to assess the condition of the engine every time when changing the oil. So with that in mind, hoist up the front of the car on jack stands. This car has a very low ground clearance and it’s impossible to access anything under there.

Start with locating the oil filter element in the engine bay. It is on the right side of the car just behind the turbo. It is a bit cumbersome to reach with a socket, but you don’t need any special filter tool to remove it. The access will be much easier if you have a socket with a joint as shown in the picture below. Take out the old oil filter and then move to beneath the car.

Oil filter 180cdi
Oil filter location. Use a socket with a joint to get better access behind the turbo

If you haven’t seen under this car, everything is hidden beneath plastic panels. You have to take at least 2 of the panels off to get access to the oil drain plug. The oil drain plug is also a joker to find, since it’s not where you expect it to be traditionally. It’s at the very rear of the engine far behind the front wheels. It is the most left plug on the engine block (see image).

Oil drain plug location B180CDI
Oil drain plug location on the 180CDI. You need to remove some plastic panels to find it.

I’m not sure what the plastic panels are for except aesthetics and hiding the under body. Also it can trap moisture and rust. They have some very subtle sound dampening effects and can keep some of the dirt away. Maybe it decreases air drag at high speeds? But I didn’t bother to put them back on. They were quite cracked and had a large hole due to the low ground clearance. I prefer seeing whats going underneath the car and the ability to wash off the salt underneath there especially in the winter.

Now that the drain plug is located. Start drain the oil and try not to loose the plug into the pan when opening it. The oil should drain a while until the dripping stops. Then take the new drain plug with the new copper washer and use that to plug the drain. Do not overtighten! Maximum 30Nm.

Draining oil from 180CDI
Draining oil from the 180CDI

After the drain plug is secured. Then it’s time to change the oil filter. The oil filter cap contains two rubber seals, remember to change both of them! Use a rag to clean up inside the oil filter housing for old oil. Mount the new filter onto the oil filter cap and then reinsert the filter cap into the filter housing. Tighten the filter housing to max 25NM. Over tightening will ruin the plastic so be careful.

Oil filter kit parts B180CDI
Oil filter kit parts. Note the two rubber seals, along with new drain plug and washer. See the old filter how deteriorated it is, it’s almost falling apart. Indicating cheap filter and overdue service interval. The new filter is a honeycomb structure and not a cheap paper filter like the old one.

Recheck that you actually secured the oil drain plug under the engine before you start pouring in the new oil. The car needs 5,4L to 5,8L, but there is probably some residue and the actual amount might be a little less. Start by pouring 4,5L. Level the car in order to make a proper reading of the dip stick. Then pour little by little until max level on the dip stick is achieved.

Oil pan with old oil from diesel engine
Inspect oil from the oil pan. Since this is a diesel it’s completely black. This is normal for a diesel. Also use your smell, does it smell really burnt? This could indicate overdue interval. Also check for sludge at the bottom of the pan which can indicate old oil. Check for metal shavings which can indicate bearing wear and poorly maintained engine.

Check the oil drain pan for assessing the health of the engine and if the service interval have been overdue. Luckily there were no sludge or metal shavings from my oil, but it smelt strongly burnt. Which with the low oil level may indicate an overdue oil service interval. Thankfully I switched this oil in this before doing any driving at all after getting it. The engine is quite strong and starts easy without any smoking indicating a healthy engine still. Phew!

Now the last part is to tell the engine computer that an oil change have been done and reset the service interval. The annoying wrench and reminder every time you start the car will then go away. Unfortunately I didn’t take pictures of this process, but it’s really a straight forwards procedure.

  1. Connect the OBD2 to the connector underneath the steering wheel.
  2. Select the car and engine type with manufacturing year
  3. Go on the menu which you can reset oil service interval. These can be different depending on the type of reader, but should be pretty obvious
  4. Set that oil service have been done, this will remove warnings on the dashboard
  5. While you’re at it, do a scan of error codes if any

Now you can do an oil measurement while the key is inserted and the engine is off. You can access this through the interactive computer in the dashboard through the buttons on the steering wheel. The car will then tell you if the level is OK or not.

If everything is OK and no service interval warnings. It’s time to start the engine. While the engine is running. Inspect underneath and see that there are no oil leaks form the drain plug and also check the oil filter housing for leaks. If no leaks, go for a small 5min drive. When back, recheck the dip stick level when engine is off. Refill more oil if necessary. Also recheck for leaks underneath and at the oil filter housing.

Robs out!

New daily driver – 2008 Mercedes B-Class 180CDI W245

2 L Diesel with 109 hk Turbo and CVT Auto transmission. Front wheel drive, with transverse mounted front engine. 5 seats with made from fabric. Not washed in a while with a strong smell of dogs. Some broken stuff like windshield wipers. Welcome to my new 2008 B-Class W245.

“So boring and dull! How can you endure this torture?!? It looks like an egg! It’s not even a real Mercedes! Did Mercedes poop it out from Stuttgart? B for bloopers! I would turn 180 degrees around when seeing this car!”

I can hear some of you thinking this. And perhaps you have a point. It was considered quite ugly when it was first released, however I think the design have matured somewhat and is not that ugly anymore. It blends in with all the other boring cars and it’s still quite dull though. But I needed something cheap, reliable and fuel efficient for commuting to work especially during the winter. And fast before winter starts! A diesel is good since I can save around 2 kr for each liter and it’s more lean than a similar sized petrol engine. I generally don’t like front wheel drive at all, but for commuting during winter in the steep hills around here it’s somewhat of a benefit.

Mercedes B-Class w245 rear
Egg shaped??? Is it a Peugeot?

The car has done 250.000 km which is not little, but not super far either. I got the car cheap which means it didn’t come perfect and has a few things to sort out first. The most critical is the front wind shield wiper which is broken. Second most critical is a faulty parking brake which require new cables in the rear. There had also been drainage of the electricity of the car battery while the car was parked, however this could be due to the non-original extra lights or something with the broken wind shield wipers. Both front and rear are not currently working. The rear one not working is not required by an MOT, but it is annoying when the side mirrors are so small you can’t really see what’s straight behind the car.

Mercedes B-class w245 side
Some hints of rust on the wheel arch, nice!

Cosmetically there is some rust on the wheel arches and below one of the doors. Thankfully there are no holes and the rust can be stopped quite easily. Actually the amount of rust on this car is quite little compared to the age and mileage of such a car in Norway due to all the road salt it’s exposed to during winters. It could also do with some standard service, such as changing the oil, diesel filter, air filter and the pollen filter. Oh, and did I mention it’s not even approved for the MOT haha!! So it could potentially have some more unknown issues!! Exciting!

TODOs before it can be MOT approved is as follows:

  • Replace front windshield wiper mechanism
  • Fix parking brake
  • Stop rust on wheel arches and paint
  • Replace rear wiper motor
  • Engine Oil and filter change
  • Air intake filter
  • Cabin pollen filter
Mercedes B-Class w245 interior
Interior is OK looking, nothing special to see here.

The summer tires are extremely worn, however the winter tires are in good condition with steel studs which is required around there. And winter is just around the corner. Will not bother to get the new summer tires until the spring. The 280CE also needs new tires and will get the priority now. I will keep you updated with follow up articles.

Robs Out!