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  #1  
Old 10-25-2013, 11:06 PM
zonanavystar zonanavystar is offline
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synthetic transmission fluid

2001 Prostar 209 Predator 310 HP, ZF Hurth 450 transmission. First transmission fluid change since I bought the boat. Any thoughts on Valvoline full synthetic transmission fluid? I know there are discussions about not switching to synthetic with these motors, but how about the transmission? Thanks.
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Old 10-27-2013, 08:52 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Synthetic transmission fluid is 100 percent compatible with conventional fluid, ensure you get the correct rating. Synthetic fluid will not cause any seals to swell or clutch pack problems, just old urban myths that need to die.
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Old 10-27-2013, 09:14 PM
bigmac bigmac is offline
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What would be the point in using synthetic transmission fluid? The shear stability of Dexron VI is excellent, especially in these non-torque converter, low temperature, absolutely simple transmissions.
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Old 10-27-2013, 09:17 PM
Cloaked Cloaked is offline
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Quote:
Originally Posted by bigmac View Post
What would be the point in using synthetic transmission fluid? The shear stability of Dexron VI is excellent, especially in these non-torque converter, low temperature, absolutely simple transmissions.
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Old 10-27-2013, 09:58 PM
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Indifferent as to "why" to use synthetic dexron III, most dexron VI is a synthetic blend.
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Old 10-27-2013, 11:12 PM
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mikeg205 mikeg205 is offline
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I spoke with Hurth regarding 100% synthetic ATF - 100% Synth ATF is not recommended. I wanted to put it into my Transmission for the benefits of synthetic base stocks as mentioned above. That being said Hurth Tech says it will cause transmission to slip - I spoke with the office in Florida.

I use the Castrol Blend Dexron VI which is ok.
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Old 10-27-2013, 11:32 PM
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If the manufacturer does not recommend synthetic fluid, I would follow those instructions. Did hurth release a service bulletin?
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Old 10-27-2013, 11:35 PM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
If the manufacturer does not recommend synthetic fluid, I would follow those instructions. Did hurth release a service bulletin?
I did not ask about that - but they were very specific about not using it. Good question James - maybe someone could shed some light on that.
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Old 10-27-2013, 11:39 PM
zonanavystar zonanavystar is offline
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i asked because all i found was synthetic at NAPA the day I went shopping. However this weekend I found Pennzoil dex/merc conventional, so that's what I used. Interesting conversation, and thanks for the information.
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Old 10-27-2013, 11:42 PM
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Advance Auto and Autozone carry the Castrol Transmax Dexron VI.
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