so it looks like its only engine oil that leaking because the transmission fluid should have a red color. By the looks of the pictures you've posted... im confident that your rear main seal is leaking. This would require you to take the transmission, clutch and flywheel off in order to replace. It's not crazy difficult todo but its tedious and intimidating. (especially if this is the first time doing anything big) . here is the part number 12279-AD205 Rear main seal, SR20 engine
P10 Manual Oil Leaks
Hey all, I’m the new owner of a manual 1995 G20T and I’m excited. Love driving the car. It appears to be very well taken care of.
The only thing I’ve noticed so far is some major oil leaking on the bottom of the car. Mainly around the oil pan and the transmission. There was a lot of grime all around the bottom. The top of the engine is very clean. I pressure washed most of I can see better now. It’s very clearly leaking both engine and gear oil. I can touch the transmission and it has a noticeably unique smell, texture, color from the engine oil. I ordered a new oil pan gasket because I can see no damage to the oil pan. It looks like RTV was used last to seal it but I’m guessing that seal is worn/old. Hopefully the leaking ends there with the gasket change…
Now to the reason I’m posting, how the hell do I tell where the gear oil is leaking from exactly? Is there a list of transmission seals and gaskets that I can look to? Trying to figure out which parts I need to order. I think I’m finding it right along the seams of the transmission housing. But what are the gaskets or seals called? I’m about to pull the transmission to help me better assess what is going on. Thought of hiring a shop but I imagine the cost is north of $1500 to seal up the transmission. So I’m going in myself. This will be the biggest thing I’ve done on a car so, wish me luck.
The pictures are hopefully clear, but show before and after I cleaned the transmission.
![Automotive tire Automotive lighting Hood Bumper Motor vehicle]()
After cleaning and a drive you can slightly see some oil leading to the bottom edge/lip of the bell housing.
![Hood Automotive tire Automotive lighting Motor vehicle Bumper]()
The only thing I’ve noticed so far is some major oil leaking on the bottom of the car. Mainly around the oil pan and the transmission. There was a lot of grime all around the bottom. The top of the engine is very clean. I pressure washed most of I can see better now. It’s very clearly leaking both engine and gear oil. I can touch the transmission and it has a noticeably unique smell, texture, color from the engine oil. I ordered a new oil pan gasket because I can see no damage to the oil pan. It looks like RTV was used last to seal it but I’m guessing that seal is worn/old. Hopefully the leaking ends there with the gasket change…
Now to the reason I’m posting, how the hell do I tell where the gear oil is leaking from exactly? Is there a list of transmission seals and gaskets that I can look to? Trying to figure out which parts I need to order. I think I’m finding it right along the seams of the transmission housing. But what are the gaskets or seals called? I’m about to pull the transmission to help me better assess what is going on. Thought of hiring a shop but I imagine the cost is north of $1500 to seal up the transmission. So I’m going in myself. This will be the biggest thing I’ve done on a car so, wish me luck.
The pictures are hopefully clear, but show before and after I cleaned the transmission.
After cleaning and a drive you can slightly see some oil leading to the bottom edge/lip of the bell housing.
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oops you are right. i guess im used to using Redline MT90 (which is red) but i'd assume most other off the shelf stuff is clear/amber.
![Automotive tire Motor vehicle Crankset Bicycle part Rim]()
this is what the inside looks like. there really isnt anywhere from inside the transmission to leak fluid unless something is really really wrong. The axle seal towards the left in this pic could totally leak oil but you'd see it being flung everywhere. I think you might see a difference in the oil coming from the bottom since its probably picking up all the clutch dust and being mixed with the engine oil.
this is what the inside looks like. there really isnt anywhere from inside the transmission to leak fluid unless something is really really wrong. The axle seal towards the left in this pic could totally leak oil but you'd see it being flung everywhere. I think you might see a difference in the oil coming from the bottom since its probably picking up all the clutch dust and being mixed with the engine oil.
It looks like the right shape… guess we’ll see when I put it on… unless you recommend RTV?
Oh. Guess I better get some RTV instead then. What brand do you recommend?
After looking at all the gunk I’m really not certain if this is even the oil pan… or maybe it’s years of other leaks that have been fixed but never cleaned off… I’m not sure. There’s no fresh oil leaks, so wherever it’s coming from must only be leaking when the engine is going?
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