REAR MAIN SEAL LEAK

[Jimma61]

I'm just guessing I have a rear main seal leak as I've looked under the car and there is all all down the transmission, I've driven it for months like this so I would say it isn't serious. My question is what are people's thoughts on stop rear main seal leak additive for my next oil change will it do the job as I don't have enough money to replace a new rear main seal or don't see any point if the car is 16years old.

 

[NeddyBear]

Give the Nulon Engine Stop Leak a try, we add a bottle to the oil at every oil change and no leaks ever.
The first bottle it takes around 14 days or 500ks to take effect but well worth the wait.
Would be interesting to see if it would work on a nasty rear main seal leak.

 

[VT13]

Don't worry about it unless you are topping off the oil often or you are messing up the driveway/garage floor. Stop leak.....won't hurt it but as usual the smaller the leak the more effective they are. Could also consider using a heavier grade oil in an old Commy, 20W50/60, thicker oil leaks less.

 

[Sean880]

I'm just guessing I have a rear main seal leak as I've looked under the car and there is all all down the transmission, I've driven it for months like this so I would say it isn't serious. My question is what are people's thoughts on stop rear main seal leak additive for my next oil change will it do the job as I don't have enough money to replace a new rear main seal or don't see any point if the car is 16years old.

It's your car and you can put what you want in it and live with the results but I would.........

1. Never use a stop leak product in your engine oil. These materials contain solids and you don't ever want solids floating around in your engine oil potentially blocking engine lubrication orifices. (If they did not contain solids the stop leak product would just flow out with the engine oil through the leak area).

2. Continue to use the GM recommended oil for the engine and keep topping it up. If the leak gets very bad you are going to have to attend to it. Don't use a heavy viscosity engine oil to try and mask the problem as this will simply impair the lubrication process in your engine.

Lucky you don't live in NSW where they have mandatory annual registration road worthy checks for 5 yo plus vehicles and where the underside of the vehicle is supposed to be thoroughly checked.

 

[KustomKulture62]

Me to love the Nulon Stop Leak, an amazing product. I'd give the product a try because its never had any negative affect on my engines or differentials.