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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #31  
Old 02-12-2020
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Quote:
Originally Posted by badandy View Post
The synthetic didn't cause your leak.

Thank you!


A voice of reason, not imagination...
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  #32  
Old 02-12-2020
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Originally Posted by Good Ole Bird View Post
Thank you!


A voice of reason, not imagination...
The synthetic probably didn’t cause the leak. I think most mechanics would agree that putting synthetic in older vehicle that’s been run on dino does sometimes lead to leaks. So it kinda did cause the leak.
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  #33  
Old 02-12-2020
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Quote:
Originally Posted by Good Ole Bird View Post
Thank you!


A voice of reason, not imagination...

I've followed Badandy for quite some time and hope to be half as knowledgeable someday. But it's not my imagination; synthetic leaked, dyno did not. 20,000 miles and pictures to prove it
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  #34  
Old 02-12-2020
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I believe that it leaked, but it had to be a bad casting or something. That's all I was saying.
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  #35  
Old 02-12-2020
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BadAndy, what weight do you like to use?
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  #36  
Old 02-12-2020
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I have no dog in this fight because it has never happened to me, but in my 12 years on this forum, there have been a bunch of people that have switched from dino to synthetic in trannys and other things and as soon as they did, it leaked. There must be a reason and coincidence isn't one of them. I think most have determined that the synthetic damages the seals. I don't know anymore than that, but I won't be changing over because of that.
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  #37  
Old 02-12-2020
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Lucas 75-140 synthetic, I just went and looked at the pail. Good to -40
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  #38  
Old 02-13-2020
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75-140 for all
i use dino
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  #39  
Old 02-13-2020
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Here is my take on “synthetic leaks”... I believe synthetics act as a cleaning agent as they circulate through the system, thus uncovering problem areas that were filled with gunk.. most synthetics are backwards compatible and I would research what you use.. my diff is going to get Lucas 75-140, as I just drained it to fix the rear wheel seals. If I uncover leaks due to use of synthetics, I find it’s like a leak finder.. it just saved you from a problem down the line..
I have found the same issue come up with Bio-diesel... many think it causes leaks, but it’s a great detergent and it cleans all the gunk out of the fuel system uncovering leaks.. it’s true that it’s not compatible with old rubber lines, but for the most part the leaks come from areas where there was already a potential for leaks.. just my 2 cents..
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  #40  
Old 02-13-2020
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We just put 1500 miles on Shawns old coach with the 85-140 Dino oil in it and no leaks.
I am certainly no expert but not the first time I have seen the change to synthetic leak and the change back solve the issue. Does't make sense to me that the synthetic cleaned the gunk out and changing back to Dino put it back. Maybe the synthetic just isn't compatible with some of the older seal materials. Who knows, wouldn't be the first time the design engineers were wrong.
Some of you may remember way back when Arco came out with graphite motor oil. We had an Arco Station @ the time and some cars that we put it in it worked as advertised . other cars started to burn oil like crazy. Switched back to conventional oil and issue went away. No rhyme nor reason to it. Couldn't correlate it to mileage or any other commonality. Sent samples back to Arco's labs and never did come up with a reason.
Like I said, who knows, anything is possible.
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