Transmission losing oil

[krjt]

I have a 89 300E and just recently it started to lose transmission oil. It does drip a little, but not at the rate it is disappearing.

Is there a vacuum modulator in these transmission where the vacuum rubber ruptures and gets sucked into the intake manifold?

I plan on checking the plugs this weekend for oil and the antifreeze too.

Any thing else I should look into?

[MattBelliveau]

Better make sure it's not mixing with your coolant...

[slk230red]

Originally Posted by krjt

I have a 89 300E and just recently it started to lose transmission oil. It does drip a little, but not at the rate it is disappearing.

Is there a vacuum modulator in these transmission where the vacuum rubber ruptures and gets sucked into the intake manifold?

I plan on checking the plugs this weekend for oil and the antifreeze too.

Any thing else I should look into?

Check the vacuum hose at the intake coming from the Vacuum Modulator for signs of fluid. Mine was leaking and burning trans. fluid through the engine. I replaced the VM about 3 years ago and no problems since.

[krjt]

I couldn't find the vac. line at the manifold, so decided to pull plugs instead. #6 looks fine, dry and normal. Also compared with a few others and firing end looks consistant.
Luckily or unluckely, I had my water pump replaced recently and I knew the color of antifreeze should be good and I do not see any signs of oil in the overflow tank.

Next seems to be getting under and look for signs of oil.

Any particular areas to start ? Any known weak O rings?