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Old 11-03-2019, 12:08 AM   #1
Skoolie
 
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Location: Calgary, Alberta
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Year: 2001
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Oil leaks with synthetic

Has anyone switched to synthetic oil in their bus and ended up with leaks? I’ve heard from a few sources that switching to synthetic oil in an older engine can cause leaks to appear that weren’t there before.

It makes sense that since synthetic is less viscous that it could leak through small places the a thicker oil couldn’t but has anyone done the switch to synthetic? I’d be curious to know either way leaks or not.
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Old 11-03-2019, 12:21 AM   #2
Bus Nut
 
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Engine: Chevy Express 3500 6.6l
Nah. Viscosity should be the same. Bubba myth!
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Old 11-03-2019, 12:57 AM   #3
Skoolie
 
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Location: Calgary, Alberta
Posts: 173
Year: 2001
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Chassis: Thomas
Engine: Cummins ISC 260HP/660Torque
Rated Cap: 81
Oil flow test at 7 minutes in this video. T4 is the 15w40 conventional motor oil. T6 is the full synthetic 5w40. “Cooked” was heated earlier in the video for a couple hours.

https://youtu.be/Pa4RwsiZUmI
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