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Here's a good Question... #3849840 09/10/15 10:43 PM
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Rockrz Offline OP
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I know someone that has an older vehicle with about 170k on it that runs perfectly. Plugs are dry when pulled and inspected and the engine (GM) has plenty of power so it makes no sense to do a reman engine really at this point.

But, the rear main has recently started to leak a little. They change the oil every 5k and have to add a quart every 3k or so. They have been running Amsoil (since about 75k) like I do on mine and the thought has come up that maybe the Amsoil is so clean that it contributed to the seepage.

So, I think they are going to try some Bar's Leak or something similar to see if that helps the rear main to stop leaking.

So, what's the general consensus on continuing to use Amsoil in this situation?

Think it would be better to keep using it, or switch to a conventional oil?
Just curious what the local oil experts here on the board recommend.

Re: Here's a good Question... [Re: Rockrz] #3849848 09/10/15 10:52 PM
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HangFire Offline
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Try a high mileage oil. Stay away from Bar's Leak.


Various musings: http://hangfire.net
Re: Here's a good Question... [Re: Rockrz] #3849850 09/10/15 10:53 PM
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dlundblad Offline
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Personally, I would ditch the additive and use a high mileage oil.

Mobil 1 HM or Pennzoil HM would be my personal choices. Others here have had great experience with Valvoline Maxlife blend.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980 (Ecore)

Re: Here's a good Question... [Re: Rockrz] #3849865 09/10/15 11:05 PM
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Rockrz Offline OP
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I've talked to a few folks over the years that claim to have had good results using Bar's Leak. Isn't this stuff supposed to swell the seals a little?

Isn't Mobil 1 high Mileage still using a synthetic?

It's a V6 so what would work best, an 10W30?





.

Last edited by Rockrz; 09/10/15 11:10 PM.
Re: Here's a good Question... [Re: Rockrz] #3849872 09/10/15 11:13 PM
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CT8 Offline
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5,000 miles with Amsoil?

Re: Here's a good Question... [Re: Rockrz] #3849876 09/10/15 11:17 PM
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Brybo86 Offline
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Which car and engine, is it difficult to just change the rear seal?


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
Re: Here's a good Question... [Re: Rockrz] #3849880 09/10/15 11:19 PM
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Rockrz Offline OP
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They say the transmission needs to be removed in order to do a rear main seal which is going to cost a lot.

Re: Here's a good Question... [Re: Rockrz] #3849916 09/10/15 11:59 PM
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ryanschillinger Offline
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Try a high mileage oil for a couple OCI and see if it reduces or stops the leak. The problem isn't that the oil is synthetic, but he seal might have shrunk some over time. High mileage oil has conditioners that help keep seals working. My old Camry had 307k when I sold it. It had several very minor oil leaks. I used some Mobil HM oil for 2 consecutive oil changes and it very noticeably reduced the amount of oil used between changes.


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Re: Here's a good Question... [Re: Rockrz] #3849921 09/11/15 12:04 AM
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Branson304 Offline
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Since the oil leak is fairly minor, I'd suggest switching to a high mileage oil. High mileage oils have special additives to recondition & swell the oil seals & gaskets in the motor. I'd suggest Valvoline MaxLife Synthetic Blend. Mobil 1 Full Synthetic High Mileage is my second pick. Valvoline also makes a MaxLife full synthetic but it's extremely difficult to find in my area. Anyway, these oils will help reduce the oil leak and maybe even stop it completely after while.

I don't suggest using any additives like Bar's Leaks. I don't figure it would do any harm, but a good high mileage oil would be best in my opinion.

Re: Here's a good Question... [Re: Rockrz] #3849924 09/11/15 12:07 AM
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Rockrz Offline OP
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OK, so apparently the high mileage oil contains additives that conditions the seals right?

Seems like they could use the Amsoil and just dump some additive in.

Question is, what additive does Mobil 1 put in their oil?

Do they sell a stand alone additive?

And, what would be wrong with using Castrol GTX High- Mileage?
Lots of folks like Caster oil



.

Last edited by Rockrz; 09/11/15 12:12 AM.
Re: Here's a good Question... [Re: Rockrz] #3849929 09/11/15 12:28 AM
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Rockrz Offline OP
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Doesn't Amsoil make a high mileage oil that has special additive to condition seals?

Re: Here's a good Question... [Re: CT8] #3850009 09/11/15 05:33 AM
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Kuato Offline
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Originally Posted By: CT8
5,000 miles with Amsoil?


Right! Unless it is a short tripper the oilcould go much further, even if it is not SS.

As far as the seal, 1 quart in 3000 miles isn't much so just drive it....get the seal fixed if it is worrisome, but adding something to clog the leaky seal only masks the problem and won't cure it. A HM oil might fix it but if it doesn't he is right back where he started as well as having switched away from his chosen oil.


Thick vs Thin test: 15k / 43k miles complete
Re: Here's a good Question... [Re: Kuato] #3850156 09/11/15 08:44 AM
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zuluplus30 Offline
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Seals wear out. Plain and simple. Amsoil or conventional, it's just going to happen at some point. I do agree 1q every 3k is minimal and echo the HM oil recommendations.

Re: Here's a good Question... [Re: Rockrz] #3850160 09/11/15 08:46 AM
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HerrStig Offline
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Check the PCV system.

Re: Here's a good Question... [Re: Rockrz] #3850623 09/11/15 03:35 PM
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Brybo86 Offline
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Originally Posted By: Rockrz
They say the transmission needs to be removed in order to do a rear main seal which is going to cost a lot.


Once again please

Year, make , model and engine


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 199k
95 Yamaha Jog
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