rworcester

When we've fired up the engine for the first time, I have a pooling of oil around the oil sending unit hole in the rear of the block. Since I have a turbo I'm also using that port to supply fresh oil to the turbo. I have p/n 070.255 from Holden as a tee back there to supply oil to my turbo, sending unit, and oil pressure gauge. But the hole is tapped with straight threads, not NPT. And I don't have a crush washer or anything, so where is the mating surface between the block and the oil sending unit? Since I have metal on metal, there is a slight leak.

wannafbody

iTrader: (2)

I believe those are pipe threads for the oil pressure guage. You may need to use teflon tape on your adapter.

Redbull87

iTrader: (3)

On my previous lq4 i thought my opsu was the culprit of the oil leaking in that same area but it was the cam sensor 0-ring.I replaced the 0-ring and was good to go. Both of those are common to leak and replace them at the sametime.

rworcester

I did figure out the problem. When we cleaned off the oil and started the car with a flashlight and mirror, we found the leak coming from the oil sending unit itself on top of the adapter. It just needed a 1/4 turn to fully tighten it. No more leaks and on the road finally!