Heavy oil to stop leak?

[jessealan]

I just purchased an 85 subaru with a decent sized oil leak. Is there any oil out there that would slow or stop a leak? 15/40? Also any additives.

 

[dickwells]

Many years of driving worn out cars to high mileage has shown me that the type of leak is all important. Quite often a lighter oil can reduce the leak. Remember that heavier oil raises the oil pressure, causing the oil to come out faster. A high quality light oil may work for you but you should let us know where the leak is located. RW

 

[jessealan]

I am takeing it for a buddy to look at this weekend and I will post what we find. The high milage supertech might a good cheap oil to try.

 

[sprintman]

Leak from where?? If seals then do an Auto-Rx clean and should reduce or stop IMO.

 

[jessealan]

It looks like a rear main seal leak. Does that auto-rx stuff really stop leaks?

 

[TooSlick]

The AutoRX will clean the abrasive deposits from around the lip of the seal, so this will reduce or stop the leak in many cases.

I have been trying some on a high mileage Audi and the stuff really seems to work. I'd run it for 1000 miles total and change just the oil filter after 500 miles.

 

[jessealan]

I changed the pcv valve and it really minimized the leaking. I am probably going to run super tech 10w-40 with supertech filter. I do not want to pay the two dollars a quart for the high milage stuff.