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Old 09-29-2022, 08:47 PM   #1
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Join Date: Sep 2022
Posts: 6
Question What is this fluid? Pics attached...

Hi all, long time lurker first time poster. What is this fluid? It's really thick, it's almost solid and rubbery. I can poke my finger in and it feels more like silly putty than anything else.
While it's possible I just missed it before, I feel like this issue came up after we had to be towed (loaded onto flatbed).

The last picture, 5, is of the oil drain. I touched it and a drop of black liquidy oil coated my finger, but that has very different characteristics of the fluid dripping down.

Thanks for the help!

2001 Bluebird 30ft
5.9 Cummins 24v
Attached Thumbnails
1.jpg   2.jpg   3.jpg   4.jpg   5.jpg  

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Old 09-29-2022, 11:29 PM   #2
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Join Date: Sep 2019
Location: Northern Virginia
Posts: 578
Year: 2001
Coachwork: Thomas
Chassis: MVP ER
Engine: CAT 3126
So the fluid on the bottom of the oil pan is definitely engine oil, it's not uncommon to see oil leaks on old diesels. Actually probably more rare to see one that doesn't leak somewhere.

The thick stuff on the other hand, my first thought is grease. I've seen it come out of joints that have been just been greased like that, however that's quite a bit tho and it's usually obvious cus you just greased it. I also can't think of any grease points directly above the axle on the passenger side.

Perhaps someone greased the spring leaves to cut down on noise or something?

There's a tiny chance the bus has an auto lubricator and a line to a the spring pivot has burst. I've only seen those on fire trucks tho, never heard of them being common anywhere else outside of heavy equipment. If one is present there will be a bunch of little lines going to grease fittings on the suspension and sometimes the steering.

Can you provide any further details on the leak? I.E. when is it appearing, does it get worse if the bus idles? More pictures of the engine bay especially on the passenger side
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Old 10-02-2022, 09:49 PM   #3
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Thank you for the reply! Here's a pic of the drip pan under the bus as well as passenger side engine bay, which looked absent of this fluid to me.

I drove the bus for the first time in a couple of months yesterday, and saw no marked change in the level of fluid coming off the bus.

This latest drip pan photo is probably indicative of the amount that's leaked out over the last month or more, whereas the first photo I posted (where the fluid was dripping in more of "lines" shape) was from a few months ago, and much more was coming out then. (Like the amount in the original post's first photo dripping every time we parked).
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Old 10-09-2022, 07:41 PM   #4
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cummins, fluid, mystery, oil

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