A few days ago I was doing some "Highway tuning" on my car. I was taking it to about 7500 RPM. After like 10 minutes I started smelling oil. Turned around, went back to the gas station I started from and saw a PUDDLE of oil under the car. My first thought, Holy Fuck I already blew it up. I still had half an oil pan of oil though, so I got it home, jacked it up and saw oil all over the back of the block. Ended up changing the OPSU. When I unplugged the connector oil dripped out of it. Got the sensor out, it had a tear in the plastic diaphram. Put new sensor in, no leak or burning smell.

Tonight I did the same thing, few freeway pulls. Didnt notice any leaks or smells until I got back to the gas station. It wasnt dripping off the car at all, but for about 10 seconds smoke was starting to billow from the engine bay, from oil dripping on the downpipe in the back again. Crawled under and looked, didnt see as much oil but it was still on the block. The burning went away by the time I got home.

If it was my rear main seal (god forbid), wouldnt oil be coming out of the little rubber boot where the clutch arm goes in, or the inspection plate? There was none there, but its all over the rear motor mount, the downpipe, passengers side axle and actually a little on the head, Im assuming from the wind at 80 MPH. Oil cant really LEAK from the HG can it?

Yes, oil CAN leak from the headgasket. It's rare and I'd check the coolant to see if there's any oil in there first. If not I'd double chech that you got the new OPSU completely tight

Ok will do. Should the sensor be tightened all the way down, or a few threads left as long as its tight and the thread sealer is well into the block?

As far as I know my coolant is still coolant, and my oil still looked fine on the dipstick.

Originally posted by RoninEclipse2G
Yes, oil CAN leak from the headgasket. It's rare and I'd check the coolant to see if there's any oil in there first. If not I'd double chech that you got the new OPSU completely tight

This is how my HG blew.

Originally posted by teklein

Originally posted by RoninEclipse2G Yes, oil CAN leak from the headgasket. It's rare and I'd check the coolant to see if there's any oil in there first. If not I'd double chech that you got the new OPSU completely tight

This is how my HG blew.

My HG was leaking when I first bought my dsm. Oil leaked on the back of the block, head, and downpipe. Not trying to spook you, but seems like you gonna have to replace yours.

Definitely might be the HG. And you are correct, if it was the rear main you would see oil coming out from the where the inspection plate meets the bellhousing.

make sure that this isnt residual oil from the first leak. clean everything.

Originally posted by 420agreenvilleSC
make sure that this isnt residual oil from the first leak. clean everything.

Good point Mikey. Sometimes when the previously sprayed oil gets heated up it can act like a new leak