Changed the oil and filter on the beast the other day, Mobil 1 0w 40 as recommended, 2000 year 49,000 miles car, also cleaned the MAF's and replaced the air filters at the same time. I immediately noticed a strong suction/intake noise. I thought it was due to the work on the MAF's and filters, but checking tonight it sounds like it's coming from the oil filter! Is this normal?, the car is running un-believably well and have no complaints there, just wondered if anyone can shed some light on the noise.
Thanks as always,
Stu.
ps. the cars idling also seems to hunt around between 500rpm and 700rpm of its own accord, doesn't stall but never did it before cleaning MAF's, do I need to do them again perhaps more thoroughly?

:M5launch:

sure acts like an air leak somewhere on the induction side. Check you hoses and hose clamps again. I would guess something isn't sitting snug the way it should be. Doesn't look like there is anything in the oil filter housing to make noise, unless it was cracked when you did the filter change.
Regards,
Jerry

 

Bump.

I have the same problem.

I just changed my oil and filter. I was using a Mann-Humel filter and now using Hengst.

I hear a slight hiss sound, almost like a big vacuum leak. It's coming from the filter area. Could also be power steering reservoir. But I just noticed this at warm idle after the change of oil and filter.

Is the filter housing pressusrized? Could flowing oil make this noise?

Any ideas?

Thanks!

 

There are two features of the oil filter housing, one is the drain valve at the bottom that pops up when you remove the filter and allows the housing to drain to the sump so you can drain all the oil during an oil change. It then gets pushed down and recloses when you install the new filter to stop drainage.

The other is the bypass valve that opens on high filter differential pressure to ensure the engine still gets oil even if the filter is badly plugged. Both are shown below. It could be the housing drain valve didn't reclose properly so oil is whistling back to the sump through the drain valve? The second photo shows the line from the drain valve to the upper oil pan on the extreme right. If you can access it, you could crimp it closed with pliers or vise-grips to see if the noise stops.

 

There are two features of the oil filter housing, one is the drain valve at the bottom that pops up when you remove the filter and allows the housing to drain to the sump so you can drain all the oil during an oil change. It then gets pushed down and recloses when you install the new filter to stop drainage.

The other is the bypass valve that opens on high filter differential pressure to ensure the engine still gets oil even if the filter is badly plugged. Both are shown below. It could be the housing drain valve didn't reclose properly so oil is whistling back to the sump through the drain valve? The second photo shows the line from the drain valve to the upper oil pan on the extreme right. If you can access it, you could crimp it closed with pliers or vise-grips to see if the noise stops.

Thanks for the info.

We can chalk this up to "operator error". I usually use a rubber strap wrench to remove and tighten the filter cap (just more forgiving than any metal on plastic action). I decided to hand tighten the cap this time. I noticed this noise and decided to investigate more. Once I put the rubber strap on it to tighten, it had quite a bit of rotation left. Just like any threaded joint you can easily feel the point at which it bottoms out. Make sure you get the cap snug (but no tighter) and everything should be good. 25Nm sounds about right, but id rather do it by feel in this case rather than use a torque wrench and metal socket.