MOST Misdiagnosed Oil Leak On BMW E46 M3

I am going to talk about the most misdiagnosed oil leak on BMW E46 M3. Usually, people mistake it for oil pan gasket, valve cover gasket, or rear main seal.

You can see there’s a little bit of oil leaking from right here, it could be the rear main seal or the oil pan gasket, you need to check out that CPV o-ring which is all the way up on top of the block

I post a picture if we can find one of one with the you know the actual engine out of the car

You can see where I’m trying to get it out from that way that should help you position yours once you have it loosened I want closest to the passenger frame rail went through the opening above the headers and above the cats

Put a cut this o-ring, got a section cut through it then you just pull it right off

Replace the new o-ring, you might have a little bit of oil seep out from where this valve was just clean that up before you put the valve back in, clean up all the threads, the area on the block where the sits in before you put it back in

Make sure you use a Viton o-ring that we don’t have to do this again and obviously if you have like countless headers or anything this is a lot easier.

How to Upgrade BMW E90 Halogen Headlights to LEDs?

Part and tools:

Replacement Process:

1, You want to remove the dust cover at the bottom of the wheel arch in order to get access to your headlight bulbs in the back. You need to do to remove clips and the backing cover to get access to direct bulbs.

2, Remove the clip and remove the backing cover to get access to the bulb.

3, Once you have two covers removed from your headlights, you want to take a whole shot and drill a substantial amount of the cover so that your LED fan can have a space to breathe.

4, Once you have drilled a hole on the dust cover, you want to remove your old H7 bulb.

As you can see, this is the difference between the old H7 and then you see the LED headlight has the built-in fan.

5, When installing, the first thing you’d want to do is you want to insert the h7 socket. You’d insert that and fix the socket into your headlights.

6, Once you have the socket installed, you want to insert your LED bulbs, it’s easy just by pushing it right into the unit itself.

Be sure to have your individual LED bulbs installed at which the LEDs are facing side to side, the added LED bulb itself must be facing straight, it should not be side to side.

7, Once you have your bulb correctly installed, you can close up and reinsert your covers.

8, And we just finish the replacement. There’s no modification to do, juts a simple replacement.


One thing should be mentioned:

You have to drill through the protective dust cover just to allow for the fan to have spacing to go through, but you can choose to put a plastic sealer or you can put an extra bit of anything that you can do. Just cover up the hole that you made will be all perfect, then no water will get into the headlight itself.

I haven’t had any major issues with this method. I have had the lenses getting cloudy as the lense got cold and the led bulbs do not generate as much heat as the regular halogen bulbs. Drilling through the backing cover is the only way for clearance for the bulb. I then covered it up with a piece of vinyl on each side. This prevents water getting in and any moisture forming. A more permanent solution is to shorten an aerosol spray paint cap and use a sealing silicon

Ultimate Guide to Change the Air Bag Suspension!

An air bag suspension broken will cause rear suspension sag. If meeting this problem, you gotta change an air bag suspension. But just how to do that? This is the ultimate guide for you. Hope this helps.

This was a pretty easy DIY as others had posted. But please be careful and no to injure yourself or damage your vehicle.

1, loosen the lug bolts on your wheel.

2, raise the rear and place on jack stands.

3, remove wheel.

4, this morning was one of the mornings where my bag wasn’t sagging so I had to remove the underside panel on the right side of the vehicle to locate the compressor and loosen the line going to my driver’s side bag. On our X5’s there are 2 lines; a blue and a red. The driver’s side line is the red line. However, in case yours aren’t color coded, if you are looking at the compressor from the passenger side of the vehicle looking toward the center of the vehicle the left line goes to the driver’s side and the right line goes to the passenger side air bag.

Just loosen it slightly until you hear the sounds whistling out of the line. This will deflate the suspension air bag completely. Once finished, remove the suspension air bag by unclipping the bottom of the air bag from the suspension hole. This is easily done with a flat head screw driver by pushing in on the tabs on either side and pushing up at the same time. It will “pop” right out.

5, turn the top of the bag clock-wise (IIRC) 90 degrees and the whole bag will come out.

6, loosen the 10mm nut on the air line going into the air bag and remove and discard the nut and collar. IF YOU ARE USING OEM BAG, DO NOT remove the collar and nut. You will re-use it.

Once the line is removed, discard the old bag and insert the line into the new Arnott air bag. Note, remove the white cap on the Arnott bag first. This line will not need to be tightened in place and instead will stay in place. Just make sure to push the line all the way in and secure the line along the side of the air bag (this will be obvious when you install, sorry no pics).

7, install the new bag into the upper part of the vehicle where it secures by a counter-clockwise rotation. This part was the hardest for me as I couldn’t get the tabs to line up into the whole. Once in place, you’ll notice that the air bag doesn’t extend all the way to the bottom suspension. That’s because the air bag comes deflated.

CAUTION: Note how much distance there is from the bottom of the air bag to the bottom of the suspension whole.

8, raise the driver side suspension slowly to guide the bottom of the air bag into the whole in the bottom suspension. It will easily pop into place.

Button everything back up, install wheel, start the car and wait about 2 minutes before you begin lowering the vehicle. Slowly lower the vehicle in increments so the bag can fill with air. NEVER EVER LOWER THE X5 ON A COMPLETELY DEFLATED AIR BAG.

I only did one side today but I will tackle the other side soon. Since I’ve done it once and know what I’m doing it shouldn’t take me more than an hour to do the other side.

Hope this helps for anybody experiencing the dreaded suspension sag.