I have just started the Auto-RX application for rear main seal leakage on a 1990 Lexus LS 400. Currently the car leaves 2-3 drops after a long drive, and 1-2 after a short drive. In a 1000 miles there's not a noticeable drop in oil level, but I have to leave a piece of cardboard to protect my garage floor, and have to park on the street when I visit friends. A bottle of Auto-RX costs more than a rear main seal, but replacing it is a 7-8 hour job I'm not enthusiastic about doing. The engine also appears to have some deposits, as seen in the attached photos. I put in the Auto-RX with conventional Super Tech 5W-30 at 168,400. Oil replaced was synthetic. Immediately after the change the leak appeared worse, but after the first drive returned to its previous state. After 500 miles, the oil is just beginning to look a little darker, but doesn't show much color on a paper towel. I will post updates as the treatment progresses. Let's see if this stuff overcomes my skepticism.
Auto-Rx has a specific application for stopping a seal leak. Your seal is going to leak more after Auto-Rx has finished its treatment as we clean the seal material (front & back) we don't "SWELL" any seal.
To stop the leak we rely on the additive chemistry of a non synthetic oil to restore seal pliability. Please read the application fully. Thank You.
Auto-Rx has a specific application for stopping a seal leak. Your seal is going to leak more after Auto-Rx has finished its treatment as we clean the seal material (front & back) we don't "SWELL" any seal.
To stop the leak we rely on the additive chemistry of a non synthetic oil (after Auto-Rx Application) to restore seal pliability. Please read the application fully. We are a proven product and have saved our users time and money. There is no way to tell you how many miles of driving will be required to stop your particular leak, following the instructions will guarantee the best results.
We are authorised distributors for Auto-Rx in the Persian Gulf region, and are currently testing a 2007 GMC Yukon with a rear main seal leak. We dumped in 6 quarts of Motorcraft 10W-30 and a full bottle of Auto-Rx, about 6,000 km (3,750 miles) ago. We originally planned on running this for a full 10,000 km (6,250 miles) before draining the oil and moving onto the rinse phase and plan to stick to this.
During the first 1,000 km (625 miles), we did not notice a difference in the amount of oil that was leaking. Then at around 4,500 km (2,810 miles), we noticed the leak had gotten worse. This continued until 6,000 km (3,750 miles) and the leak has lessened, but not completely gone away. I will keep updating on this application.
Auto-Rx has a specific application for stopping a seal leak. Your seal is going to leak more after Auto-Rx has finished its treatment as we clean the seal material (front & back) we don't "SWELL" any seal.
To stop the leak we rely on the additive chemistry of a non synthetic oil (after Auto-Rx Application) to restore seal pliability. Please read the application fully. We are a proven product and have saved our users time and money. There is no way to tell you how many miles of driving will be required to stop your particular leak, following the instructions will guarantee the best results.
I have read the instructions and am following them exactly. I will occasionally post my data and observations.
Car is now at 170,300; 600 miles to go before oil change. The leakage is getting worse. It had been leaving 2-3 drops after my 75 mile drive home, now it is leaving 4-5 drops. I lost about 4 ounces of oil on a recent 450 mile trip; before I wouldn't see the level drop in 1000 miles.
Oil color hasn't changed, it is still light. I won't post any new photos since there is no visible change.
I will post an update after the oil change and after it has been in there a while.
You may want to check out your PCV valve, crankcase ventilator, for operationality. If your motor can't dispell positive crankcase pressure, oil will leak from the weakest seal.
Also, it is likely that during this cleaning phase your oil that is circulating, is quite dirty. I would expect results during the rinsing phase while running on fresh conventional oil. Conventional oil will help stiffen rotational seals against the rotating crank shaft over the coarse of the rinse phase.
That's not an uncommon condition. Many seal leaks will get worse before they improve. It's a protracted process. It takes a long time for the seal to distort, it's not going to relax overnight.
Good luck with it and keep us informed of your progress.
You may want to check out your PCV valve, crankcase ventilator, for operationality. If your motor can't dispell positive crankcase pressure, oil will leak from the weakest seal.
Also, it is likely that during this cleaning phase your oil that is circulating, is quite dirty. I would expect results during the rinsing phase while running on fresh conventional oil. Conventional oil will help stiffen rotational seals against the rotating crank shaft over the coarse of the rinse phase.
I changed the PCV valve when I put in the Auto-RX. The old one was a little 'gunky' but still tested ok. I should hit the miles for rinse in a week or two. The sooner I stop feeling environmentally irresponsible the better.
I did the oil change today at 107,875 with conventional Super Tech 5W-30. The oil that came out didn't look dark, but it did have a reddish tint like varnish. The lack of blackness indicates the rings are probably doing their job. I'm not sending any oil for analysis. I'm not posting any more pics down the oil filler cap right now because it looks the same. I should have taken a photo of my dipstick, because it appears to have less varnish in the hatching and around the letters.
A better measure of leakage rate would have been time between drips while warm and idling. I tried that today, but got bored waiting for a second drip. I'll just continue to monitor the number of drops it leaves after a drive.
Correction to previous post - mileage was 170,875, not 107,875. Car now has 171,900 and there is a little improvement from when the treatment was first added. Now after a long drive it leaves 1 or 2 spots and they are smaller than when I started. Before there were drips on the underside ready to fall when I shut down. Now I don't see any oil ready to drop right away, but when I check after an hour or so a drop or two has accumulated and fallen.
I would expect the seal to reconform by the end of the rinse cycle, 3000 miles. I assume that you are running conventional super tech for the rinse phase.
I had to change the rinse oil after only 1500 miles because my wife needed to go on a trip which will exceed the oil change mileage. At that point there was still a little leakage, but it was better than when I started. I'll report when she returns in six weeks or so.
