Should I do a third Auto Rx treatment?

[Yuk]

I posted this as a reply in the "Leak after Auto Rx?' thread, but now I’m thinking it should have been posted separately.


Frank says,
"... do not use a non synthetic-semi synthetic high mileage oil.
Revisit Auto-Rx.com and read "How To Stop A seal Leak" you will have to drive anywhere from 100 to 3000 miles for reconditioned seal to restore proper pliability, than leak will stop."
I'm not sure I quite understand what Frank means in the above quote and in other statements he has made. Does he mean:
1. Don't use a high mileage oil, regardless of whether it's synthetic or conventional?
OR
2. Don't use any kind of high mileage oil, or any kind synthetic oil. Only use conventional oil all the time, period?
I ask because I performed a “Stop A Seal Leak Application” on my 1992 Nissan Sentra and it’s still leaking at the front crank seal 4000 km after the treatments.
Here’s what I did:
200,520 km - Bought car with unknown conventional oil.
201,100 km - Drained conventional, replaced with GC 0w-30.
201,978 km - One month later noticed consumption, drained GC and started Auto Rx treatment with Petro Canada Maximum 5w30.
204,812 km - Started Auto Rx rinse with Petro Canada Maximum 5w30.
207,696 km - Started 2nd Auto Rx treatment with Pennzoil 5w30.
209,627 km - Started 2nd Auto Rx rinse with Esso XD-3 15w40.
213,411 km - Drained Auto Rx rinse oil and replaced with Mobil 1 15W-50.
In the last 4189 km I've added 3L of Mobil 1 top up oil:
1L of 15W-50
1L of 10w30
And most recently, in preparation for fall,
1L of 5w30
Is Frank saying that because I used Mobil 1 after the treatments the seal repair process was interrupted? Would a third treatment fix what the first two didn't?

 

[Gary Allan]

You may just have a shot seal.

Without rereading the background rhetoric on it..


You use dino for each phase and one oci after the last rinse phase.

You had to do two to penetrate the anticipated accumulations on a car of your mileage.

Soak/purge (clean/rinse)
Soak/purge (clean/rinse)
restore
all on dino

Then go about your business with any oil, IIRC

I too can't always integrate some of the "sense behind the rhetoric" ...but the results bear them out

 

[MONKEYMAN]

I have a 93 Sentra with 167,000 miles. Front main seal replaced 85,000 miles ago. Very common repair on this engine. It may be too late for Auto-RX. Inexpensive part to replace if you can do it yourself. Here is a how to replace the seal from the Nissan Forums:

http://www.nissanforums.com/showthread.php?t=70714

I am starting Auto-Rx. Trying to stop the rear main seal from leaking, and keep the front main seal from leaking. Basically, my understanding is, if you want to do what is best for the seals, use conventional from now on, nothing synthetic, or semi synthetic/HM. Otherwise, a 3 oz. maintenance dose will be required. If you use conventional oil, the oil is sufficient without the Auto-RX. I am going to use conventional from now on since my motor has a problem with leaks. Great motor otherwise!

 

[Yuk]

Thanks MONKEYMAN!

My engine is a little different than yours. The 1990’s Sentra Classic is what you would have seen stateside around 1988. Its engine is actually the venerable and anemic 70 hp, E16i. I think the repair instructions you linked will help though. The symptom, "Oil level low, but no puddles/drips" fits my car to a 'T'! My only problem is that it's getting cold here now (only 8C today) and I don't have an empty garage to repair the Sentra in (it's filled with a 1977 Mazda RX-5 Cosmo). Unless we get hit by a fluke Chinook, it looks like I may have to wait and do the seal change in the spring.
I just hope that by spring I'm not losing 1L/ 50 km

.