5.9 Liter CR Dodge Cummins 03-07 Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection

whats the best synthetic motor oil

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Old 11-01-2008, 06:56 PM
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Default whats the best synthetic motor oil

we all here the names.Amsoil,Royal Purple,Rotell,Mobil 1,Schaffers,Valvoline.is there any oil thats better than the other?IWe run Delvac at work and Im not impressed at all.
Richard
 
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Old 11-01-2008, 07:42 PM
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I'll vote for the big A Mobil ranks right up there. What problems have you seen?
 
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Old 11-01-2008, 08:56 PM
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We run Royal Purple in all our company vehicles. Most of them we never change the oil, just change the filter and add a quart. That's my boss's idea.
 
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Old 11-01-2008, 09:18 PM
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I'd like to see an OA on one of those vehicles.
Wish I could find a company like that
 
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Old 11-01-2008, 09:43 PM
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I've ran royal purple for the 2nd time and I can't tell a difference. But I've never had an issue with any. Just thought I'd try it
 
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Old 11-02-2008, 12:21 AM
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being an Amsoil dealer myself.I always wonder if its the best oil.Im sure they say it is,but they all say they have the best product.
Richard
 
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Old 11-02-2008, 08:53 AM
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Originally Posted by svtrich
we all here the names.Amsoil,Royal Purple,Rotell,Mobil 1,Schaffers,Valvoline.is there any oil thats better than the other?IWe run Delvac at work and Im not impressed at all.
Richard
So what doesn't impress you. the fact they don't run amsoil bought from you. I use mobil delvac ,15000 km between and the oil is still clean when I change it out. 130000(215000 km) miles and all is good.
 

Last edited by snowball; 11-02-2008 at 08:56 AM.
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Old 11-02-2008, 01:01 PM
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Delvac is not a full synthetic.
 
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