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2006 is350 oil leak between engine and transmission

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Old 01-05-19, 02:23 PM
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luccis350
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Default 2006 is350 oil leak between engine and transmission

I have a is350 bone stock I just got the car and I have this major leak between the transmission and engine I don’t know what it could be I’m new to these Lexus’s I’m not sure if it’s the transmission or the motor has anyone ever had this problem

Last edited by luccis350; 01-05-19 at 05:51 PM.
Old 01-05-19, 03:04 PM
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Mike_1GO
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looks like the engine oil pan gasket needs to be replaced. by the color of the fluid I'm certain its motor oil.
trans fluid is unlikely to leak from there. a trans leak would be further back if input shaft seal, for example you'd see red fluid at the trans bell housing.
Old 01-05-19, 03:09 PM
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luccis350
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Default You said gasket

When I got on the gas a few seconds later lit was dripping oil a good amount I’m tryna put everything thing I saw out there soo i can find out what to do
Old 01-05-19, 03:20 PM
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luccis350
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Originally Posted by Mike_1GO
looks like the engine oil pan gasket needs to be replaced. by the color of the fluid I'm certain its motor oil.
trans fluid is unlikely to leak from there. a trans leak would be further back if input shaft seal, for example you'd see red fluid at the trans bell housing.
Im at a lose with being new to these cars
Old 01-05-19, 05:13 PM
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2013FSport
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There are plenty of places to leak oil from so don't go ripping the pan off.
Check the oil level, confirm it is not over full.
Take the upper covers off by the fenders and with a mirror and flashlight examine the valve covers and feed tubes to the VVT on both sides.
After that you need to get it up on a lift and look with all the lower covers off and see where it originates from.

Take a peak here:

That feed tube seen behind the pulley is a likely candidate to leak while the engine is running. Inspect both sides..


Old 01-05-19, 05:46 PM
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luccis350
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It’s definitely not coming from anywhere else but between the engine an transmission where they meet
Old 01-05-19, 06:32 PM
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2013FSport
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The rear seal is the most likely candidate which is zero fun to replace.

I can't vouch for if it can be done in car and/if the 1st ans 2nd oil pan have to come off to replace it.

If it can be done with the pans in place, the least expensive repair is pulling the transmission.

If it is misdiagnosed, a big waste of time and money.
Have you had it on a lift to look up with NO splash guards in place?

These are not known for crankshaft leaks at the rear seal.
You best pull the starter and stick a boroscope in there to confirm. Well unless there is an inspection cover to be removed.
Old 01-05-19, 08:09 PM
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luccis350
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Originally Posted by 2013FSport
The rear seal is the most likely candidate which is zero fun to replace.

I can't vouch for if it can be done in car and/if the 1st ans 2nd oil pan have to come off to replace it.

If it can be done with the pans in place, the least expensive repair is pulling the transmission.

If it is misdiagnosed, a big waste of time and money.
Have you had it on a lift to look up with NO splash guards in place?

These are not known for crankshaft leaks at the rear seal.
You best pull the starter and stick a boroscope in there to confirm. Well unless there is an inspection cover to be removed.
no it hasn’t been on a lift I don’t own one I have been under it and the place oil seems to be leaking for is between the engine and transmission but I will be getting under it tomorrow to find out more and tell you guys what I find tomorrow
Old 01-05-19, 08:26 PM
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monkey92
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could be the rear main seal. But hopefully its just the oil pan gasket. If its too hard to confirm where its coming from i would change the gasket and see if that fixes the problem before shelling out big money to remove the trans for the rear main.
Old 01-05-19, 09:25 PM
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Originally Posted by monkey92
could be the rear main seal. But hopefully its just the oil pan gasket. If its too hard to confirm where its coming from i would change the gasket and see if that fixes the problem before shelling out big money to remove the trans for the rear main.
What is the price range for something like that and would it be better to get a a healthier motor and transmission please lemme know your guys opinion
Old 01-05-19, 09:35 PM
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Guessing at this level will be spendy. Get some facts!
FWIW a replacement comes with far more risk than a proper fix.
Old 01-05-19, 09:48 PM
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Originally Posted by 2013FSport
Guessing at this level will be spendy. Get some facts!
FWIW a replacement comes with far more risk than a proper fix.
This car has almost 200k miles on it
Old 01-06-19, 06:59 AM
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Originally Posted by luccis350
What is the price range for something like that and would it be better to get a a healthier motor and transmission please lemme know your guys opinion
Ballpark something like $800...an oil leak doesn't imply there is anything wrong with the engine or transmission. It just could mean a gasket is worn out. As others have mentioned get it checked out by a qualified Lexus mechanic before attempting repairs.

Remember, when you see oil in an area that doesn't necessarily mean that's where the leak is coming from...I've had leaks from valve cover gaskets that dripped down by the oil pan.
Old 01-06-19, 08:26 PM
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IMO even if the motor is at 200k it doesnt warrant an engine swap. Oil leaks are relatively easy fix and far less expensive then say sourcing another motor and trans. Like others suggest, if you cant confirm where the leak is coming from, taking it to a mechanic would be your best bet.
Old 01-06-19, 09:17 PM
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Originally Posted by monkey92
IMO even if the motor is at 200k it doesnt warrant an engine swap. Oil leaks are relatively easy fix and far less expensive then say sourcing another motor and trans. Like others suggest, if you cant confirm where the leak is coming from, taking it to a mechanic would be your best bet.
ok all this information is great I will be pullin the car out this weekend and really seeing what’s the problem is


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