This is what an oil pressure sensor/oil temp sensor leak looks like from the top

[Groesbeck Hurricane]

'95 Euro engine in a '95 993.

I knew the seal on the oil return tube one removes to change the oil filter was dripping slightly, but there was a large amount of oil on the ground. I got under the car, hmmmm, that IS a lot of oil. From the top? Hmmm, all sorts of oil around the Oil pressure sensor and oil temperature sensor. Bet the oil pressure sensor is leaking. It was replaced about two years ago when the top end was re-done. Maybe it is now time again...

Still looking for the part number to the oil return tube gasket/seal. It is green, round, thick, and wide.

[Bill Verburg]

Originally Posted by Groesbeck Hurricane

'95 Euro engine in a '95 993.

I knew the seal on the oil return tube one removes to change the oil filter was dripping slightly, but there was a large amount of oil on the ground. I got under the car, hmmmm, that IS a lot of oil. From the top? Hmmm, all sorts of oil around the Oil pressure sensor and oil temperature sensor. Bet the oil pressure sensor is leaking. It was replaced about two years ago when the top end was re-done. Maybe it is now time again...

Still looking for the part number to the oil return tube gasket/seal. It is green, round, thick, and wide.

the oil return tube seals are 25x6mm, both ends are the same
999 707 112 40

[Groesbeck Hurricane]

Bill,

Thanks! I believe those are for the oil return tubes under the pistons. This is the oil return that blocks the long/thin oil filter at the engine. I think the number is either 999 707 316 40 or 999 707 309 40. Both are on order so we will see.

Nice shiny oil. Smells so good in the morning coming off the engine...

[Bill Verburg]

Originally Posted by Groesbeck Hurricane

Bill,

Thanks! I believe those are for the oil return tubes under the pistons. This is the oil return that blocks the long/thin oil filter at the engine. I think the number is either 999 707 316 40 or 999 707 309 40. Both are on order so we will see.

Nice shiny oil. Smells so good in the morning coming off the engine...

the o-ring for the oil line under the oil filter is 21.89x2.62mm
999 707 316 40
PET says x2

or 99 707 309 40 26x1mm x1

they must have redesigned that fitting

[Groesbeck Hurricane]

999 707 316 40 (only one "slot" in which to fit one) was the correct o-ring for my application it would appear. I do not note any leaks from around this o-ring. Installed with a slight film of oil around after wiping down all surfaces with a paper towel.

It is a chore to wipe down all the surfaces one can reach under there! A hydraulic jack and two scissor jacks to hold up the passenger side. Crawl under there and rub old socks all over the place to wipe down the oil. Seems OK today. Tomorrow is the long drive, so we will see then how it all works out!