probably your oil filter housing and/or oil cooler gaskets. oil drips on the serpentine belt and gets flung onto your airbox. as soon as I replaced both of mine, all that stopped.

 

And when you replace these gaskets take time to clean off the belts, or even replace them.

 

I just did mine on the N54. The oil puddle near the filter cap is exactly like mine was. My belt, pulley and alternator had oil on them as well. Your leak is worse but I bet the belt and pulleys are slinging it. There is 2 gaskets to replace on that housing.

After the housing I also fixed the rear oil leak at the Rh side of the valve cover.

 

Oil filter/cooler gasket replacement is an easy DIY job if you are handy. Just make sure you have the necessary sockets and wrenches before starting. I think I needed to buy an E10 ratcheting wrench when I did it.

This video gives all the details.

https://www.youtube.com/watch?v=IORcQabnoIw

When these gaskets leak they typically spray all down the front of the engine and all over the accessory belt. Depending on the age of the vehicle it might make sense to change the belt, tensioner, and idler pulley at the same time. That's what I did.

The item with the green circle on top is the power steering reservoir, which includes an integrated filter. These often leak. If the fluid still looks good you can just replace the o-ring in the cap. Depending on the age of the vehicle and condition of the fluid it may make more sense to just replace the whole reservoir. Just make sure to use Pentosin CHF-11S fluid.

 

+7, you have an oil-cooler gasket leak

 

Yes, I just replace my gasket yesterday. An easy job but and expensive gasket $50 Canadian dollars at the dealership.

 

I just replaced mine today. i had the same splatter pattern on the air filter housing unit. I was able to visibly see oil collecting in a indention on the oil housing unit itself. As mentioned before, easy DIY and gasket are not expensive.

 

This forum is awesome! I just filled up my windshield washer fluid and noticed oil on top of the air filter housing. Jumped on here and searched. Boom, found my answer. You guys are awesome!

 

Change it asap that oil has a way of causing the serpentine belt to snap and spew belt pieces. Happened to me5, covered under cpo, but a lot worse than just changing those gaskets now if you can.

 

I just ordered genuine gaskets from FCP Euro. They should be here sometimes next week. Do you guys think if I degreese the engine today, I should be fine until they arrive?

 

I got very similar leak from my bmw x3 e83 diesel. does anyone got any idea if it's another oil housing leak?

 

I'm having same issue , I have oil on top of oil filter housing like top pic and a lot of oil on alt , and all my COOLant hoses on the right side of the engine . some one please email me at afmafia@aol.com thanks in advAnce .

 

Email you what exactly? You know you have an oil leak and you know where.

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Oil

I don't know 100 percent where it is coming from I see a little oil on my filter housing , a lot on my alt , and all on my COOLant hoses . I want to email someone a pic so they can see it

 

I don't know 100 percent where it is coming from I see a little oil on my filter housing , a lot on my alt , and all on my COOLant hoses . I want to email someone a pic so they can see it

Post your pics here so many people can see it. I am sure we will have a better chance at helping you.

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You have oil filter housing leak, go have it fixed before it cause more damage that will cost you some big bucks $$$$.