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Caterpillar 3208 Solutions This sub-forum is hosted by Mike Hohnstein who has been at this kind of thing for 50+ years now, guess I'm addicted. The saga has been all about progressively larger shop space since then. Honestly, never wanted to get into the CAT 3208's that were originally considered to be a throwaway engine but that's all that works in a FC in my world. Same thing with my Ford toter, that came with a NA, too much effort to hang in a 6, so been at it with the CAT V-8 for 20 years now. In reality you can get excellent life out of a CAT 3208 if it's built correctly. Post your questions about the CAT 3208 engines here and Mike will try to help you out.

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  #1  
Old 02-20-2020
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DFB052686 DFB052686 is offline
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Default Oil/fluid recommendations for a coach that's been sitting

looking to change all fluids on the new Bird. has maintenance history, always used 15w40, from oil change places, looks like Dexron III(or whatever stock is, no notation) on trans.

*92k miles now (300hp 3208/ZF)*

- looking for recommendations between straight 30wt OR 40wt plus STP (this seems to be the magical combo?)

- should I swap the trans over to synthetic ASAP? and if so, stick to name brand fluid? does the ZF use transynd?

the rare bird has been sitting for a decade off/on. tires and records support this. oil pressure is above 60psi on gauge when cold at idle. when warmed up a bit the number drops to about 20-30. when full operating temp at idle the gauge will read ZERO. if I get the rpm's up even say 50rpm. the gauge jumps back to a reading of 20-30 or so... and sometimes the gauge "flickers" up a bit... regardless of the reading. could this be a dirty pressure sensor? failed oil pump? crocodiles in the sump?

I am also contemplating running some Dexron III in with the oil for a few miles before I do the oil/filter change. is that a poor choice?
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2006 Liberty CRD
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  #2  
Old 02-21-2020
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Mike Hohnstein Mike Hohnstein is offline
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Quote:
Originally Posted by DFB052686 View Post
looking to change all fluids on the new Bird. has maintenance history, always used 15w40, from oil change places, looks like Dexron III(or whatever stock is, no notation) on trans.

*92k miles now (300hp 3208/ZF)*

- looking for recommendations between straight 30wt OR 40wt plus STP (this seems to be the magical combo?) ^^^^
^^^
- should I swap the trans over to synthetic ASAP? and if so, stick to name brand fluid? does the ZF use transynd?( NO!!NO!! Dextron is all you need.)

the rare bird has been sitting for a decade off/on. tires and records support this. oil pressure is above 60psi on gauge when cold at idle. when warmed up a bit the number drops to about 20-30. when full operating temp at idle the gauge will read ZERO. if I get the rpm's up even say 50rpm. the gauge jumps back to a reading of 20-30 or so... and sometimes the gauge "flickers" up a bit... regardless of the reading. could this be a dirty pressure sensor? failed oil pump? crocodiles in the sump? (Source a test gage, port is @ back side of oilfilter heat exchanger. OEM gage might be weak.)

I am also contemplating running some Dexron III in with the oil for a few miles before I do the oil/filter change. is that a poor choice?
30wt/STP Dextron is fine for the trans, not so much in the engine, it doesn't need a flush, believe me.
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www.AutoTransDesign.com

http://s767.photobucket.com/user/mhohnstein/library/
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  #3  
Old 02-21-2020
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DFB052686 DFB052686 is offline
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Thanks Mike, I’ll be following your recommendations.

I have heard/seen of running a small amount of trans fluid briefly in with old oil before a change to help with cleaning re: higher detergents etc. glad to know it’s entirely not recommended for a 3208.

Possible relative info for future discussion:
Has anyone had any experience running synthetic oil in their bird? I switched my diesel liberty from synthetic 5w40 to t6 synthetic 15w40 that is marketed to “limit consumption in higher mileage vehicles” and in my Jeep it made a difference in consumption at 230k miles. Went from a quart every 2500 miles to nothing I could tell on the stick. Since 15-40 obviously works for these engines but the consumption is the issue. This might be another solution vs going 30wt?

This is hypothetical, I’m getting 30wt and stp
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2006 Liberty CRD
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Old 02-21-2020
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Steelwheels Steelwheels is offline
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There’s a few threads on oil for the 3208. Also same for the ZF,

I run Transynd in mine. I had the ZF factory in IL do my first drain and fill. Its been said the Transynd handles heat better. I travel the mountains out west the retarder heats it up running in the mountains. I like synthetics and use them when I can. Dextron probably isn’t bad and much easier on the pocket book.
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Old 02-21-2020
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Good Ole Bird Good Ole Bird is offline
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I switched my 3208 from Delo 15w40 to Rotella straight grade 30wt with 4 bottles of STP...


The engine is noticably quieter with 30 psi oil pressure at hot idle, 60 psi at 1000 rpm...


Leaving in the morning for our first real trip...


Delo 15w40 in the rebuilt MT643 seems to be just fine...
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Larose, LA
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Old 02-21-2020
Bob Horner Bob Horner is offline
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I made the mistake of using Rislone in a truck engine to remove sludge, when I would drive highway speed I would loose oil pressure, soon as I stopped for a while pressure would come back up, I discovered all of the loose sludge would clog the oil pickup tube screen when the pump was at higher rpm's.
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1985 PT40
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Old 02-21-2020
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DFB052686 DFB052686 is offline
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Quote:
Originally Posted by Bob Horner View Post
I made the mistake of using Rislone in a truck engine to remove sludge, when I would drive highway speed I would loose oil pressure, soon as I stopped for a while pressure would come back up, I discovered all of the loose sludge would clog the oil pickup tube screen when the pump was at higher rpm's.
I had nightmare visions of this type of incident, this is why I ask the questions! Thanks for the experience info Bob.
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2006 Liberty CRD
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Old 02-21-2020
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I would say it's very likely that your oil pressure gauge and/or sender are chooched. I would also suspect the temp gauge and probably voltmeter are also ready for replacement.
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Old 02-21-2020
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Whos ??
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Good Ole Bird - 1980 FC35 250T

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Larose, LA
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Old 02-21-2020
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Here’s everything you ever wanted to know or not know about STP.

https://www.bobistheoilguy.com/forum..._oil_viscosity
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