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Old 12-27-2018, 07:59 PM   #1
Join Date: Dec 2018
Posts: 14
What are these stains?

Any idea the source of these stains underneath?
Is it coolant or oil?
Could this mean a big expenditure?

5 window short bus gmc 6 L gas engine
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Old 12-27-2018, 08:12 PM   #2
Bus Geek
o1marc's Avatar
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
All buses leak. Yours doesn't look like a major leak, just a small film, not an issue to worry about IMHO.
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Old 12-27-2018, 09:10 PM   #3
Bus Crazy
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Join Date: Oct 2017
Location: Ashtabula, Ohio
Posts: 1,494
Year: 1996
Coachwork: Thomas
Chassis: International
Engine: T444E 7.3L
Maybe transmission cooler lines. Inspect carefully and fix immediately.
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Old 12-28-2018, 10:05 AM   #4
Bus Geek
Tango's Avatar
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Clean it up with a pressure washer, then monitor those areas till you find the source.
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Old 12-28-2018, 07:27 PM   #5
solleks's Avatar
Join Date: Apr 2018
Location: CA
Posts: 32
Year: 1995
Coachwork: Bluebird
Chassis: International
Engine: DT466, AT545
Rated Cap: 8 windows
thats the rust prevention coating
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Old 01-03-2019, 01:27 AM   #6
Join Date: Feb 2018
Location: Stansbury Park, Utah
Posts: 189
Year: 2000
Coachwork: Amtran
Chassis: GA39530
Engine: DT466E 215hp 620tq
Rated Cap: 40
In my humble opinion, thats not enough to worry about. DOT wouldnt bother unless its a puddling oil drip, thats just wet. Just keep an eye on the fluids and drive it.
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coolant leak, gasket, leaks, oil, transmission

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