G35 Oil Filter Leaks

F

Fire0nic3FX

Member
Hey guys


I just changed my oil and make sure the oil filter filter was on tight enough and it leaks over time. It's the actual oil filter that leaks. I lubes the o ring on the filter with oil before i put it on so that's not the problem. I've changed the oil so many times without an issue but this is the first time it leaks. This is also the first time I'm using a Bosch oil filter so maybe that's the problem? Or could I have a defective oil filter? It keeps seeping out between where the filter meets with the base of the oil cooler.

I tried making it a little bit tighter but I'm afraid to cross thread the oil cooler so I'll pass. Factory tightening torque is 13 ft lbs for the oil filter as per the factory service manual. I tighten using my oil filter socket and torque wrench.


Any ideas? Thanks :)

Sent from my SPH-L720
 
Since you did all the things I would already, the next thing left to do is to replacing the oil filter. I always take a good look at the o-ring on the filter before I put it on. I open the box and examine the o-ring before taking it the cashier if I buy at a local store. You never knows. a small crease on the o-ring will present such problem.
 
For the cost, I would try to replace the filter with an OEM one or the kind you were using before. You will not lose much oil and you can just top it up.

edit- lol, you beat me with the reply Andy.
 
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That o-ring fix is where the leak is between the block and the oil cooler. This leak is between the oil cooler and the filter. :wink:
 
If I replace the oil filter without draining how much oil will come out of the oil filter area when I take the filter off?
 
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You're going to lose some, no idea how much though. I once started loosening the oil filter forgetting that I had not drained the oil yet and it made a mess.
 
The filter itself will have like 2 oz in it, and of course some will spill out also, but it's going to drain all of it since there's a valve that stops it. At least that's what I read on another forum.
 
porkandbeans said:
What about the old gasket? Any chance when the old filter came off that the gasket didn't? Pushing double rubber could cause a leak too.
Click to expand...

I was thinking this. Ive seen and heard this happens.

I never used a bosch. So I cant say but if they all do I would of heard about it. The filter for the g35x works on a LOT of other cars like plenty of hondas. So maybe just be one bad filter, damaged in shipping or bad gasket.

Sent from my SGH-M919
 
Ok I just tried that. I pulled it out and there is no rubber stuck on there.

I checked the old filter and the rubber is still all in tack. Going to go buy a new filter and some oil tommorow. Let's see if it works :/
 
There is no need to overtighten a filter. Bosch filters use a square cross section seal such as found in brake calipers. Some filters use an O ring cross section seal. An O rings sealing potential is based on the oil pressure acting on it, not the static crushing force applied to by the mounting threads. Most O ring designs are "Full Capture" seal designs which allow the oil filter housing to make contact with the engine, so over tighting is of no value. This limits the staic crush on the O ring gasket which allows it to deform and seal under engine pressure.

Square cross section seals are not normally a "Full Capture" design unless they are used in high pressure applications like brake calipers. In oil filter use they may or may not be "Full Capture" designs. I've seen both designs on oil filters. Un-Captured square seal designs do not allow the oil filter housing to come in contact with the engine so thier thightening procedure is more critical than a "Full Capture" design. Oil filters of this type need only 3/4 to 1 full turn after the gasket makes contact with it's sealing surface. Over tightening can deform the gasket enough to cause it to leak. Under tightening can allow the gasket to protrude out of it's groove enough by the oil pressure to cause it to leak. If it's leaking after the install and it wasn't overtightened, it's more than likley a problem with the gasket surface such as a cut or the surface is too rough or uneven, it's mating surface on the engine oil cooler is deformed or scratched or there's debris between the two components.

Checking the gaskets condition before purchase is always a good idea because idiots like playing with things in stores and then put them back on the shelves.
 
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Yes fixed this issue!

You guys were right its the filter. I took the filter off today and some areas of the gasket were uneven??? Very strange......guess I should check the filters in the store before I buy them in the future.

The bad thing? When I took the filter off around 3 quarts drained. So I ended up going to the store and buying another 5 quarts and a new filter. Changed to Mobil 1 filter this time. I notice the gasket on the Mobil 1 filter is slightly thicker. Anyway so far so good no leaks. I'll keep an eye out on it for the next week.
 
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