300 miles later oil is down to bottom of dip stick wtf???
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Evolving Member
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From: hometown cali
In the oil filter assembly (housing) there's an oil cooler by-pass valve.
Try replacing it. If it goes bad, that's where your oil can leak.
Costs only about $30 at the dealer and is exactly where my oil was leaking from and I had pretty much the same symptoms as you.
This is how I determined it. Removed the passenger side wheel and fender well plastics, completely cleaned the oil filter assembly when the car was not running. Then put a piece of cardboard on the floor right underneath it and started the car. Made sure car was level.
Oil started dripping right away. Looked up, it was coming from a bolt on the back of the assembly. There are 2 bolts, one of them is actually an oil cooler bypass valve (just looks like a bolt from the outside).
Try replacing it. If it goes bad, that's where your oil can leak.
Costs only about $30 at the dealer and is exactly where my oil was leaking from and I had pretty much the same symptoms as you.
This is how I determined it. Removed the passenger side wheel and fender well plastics, completely cleaned the oil filter assembly when the car was not running. Then put a piece of cardboard on the floor right underneath it and started the car. Made sure car was level.
Oil started dripping right away. Looked up, it was coming from a bolt on the back of the assembly. There are 2 bolts, one of them is actually an oil cooler bypass valve (just looks like a bolt from the outside).
The oil cooler by-pass valve is #9
Thread Starter
Evolving Member
iTrader: (4)
Joined: Jan 2006
Posts: 397
Likes: 2
From: hometown cali
Thread Starter
Evolving Member
iTrader: (4)
Joined: Jan 2006
Posts: 397
Likes: 2
From: hometown cali
Back with stolen pics to explain what's happening


The area I circled red is where I am leaking from. It's the outlet for the oil cooler on the oil filter housing.
After taking the hoses off, my outlets look a lot different from the ones pictured. I have a rough round edge at the end of the outlet. My hose just goes over it with a metal clamp.
The ones pictured has a round tip at the end of the outlet with a hump hose or coupler of some sort.
Can anyone confirm what I am suppose to have. My car is a 2004 Evo.


The area I circled red is where I am leaking from. It's the outlet for the oil cooler on the oil filter housing.
After taking the hoses off, my outlets look a lot different from the ones pictured. I have a rough round edge at the end of the outlet. My hose just goes over it with a metal clamp.
The ones pictured has a round tip at the end of the outlet with a hump hose or coupler of some sort.
Can anyone confirm what I am suppose to have. My car is a 2004 Evo.
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