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  #1  
Old August 4th, 2006, 03:29 PM
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Mike Lynch
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Diff oil questions

I am wondering if anyone has every had any experience/knowledge with Lucas 80/90 gear oil for the diffs and trans case. Would it be the best to use. I know that is what's in there now and thought if I should keep that or change to another brand. Also I am going to give AMSoil a try (60,000 miles of Rover) and was wondering if 10w40 is the best to go with. I live in lower Michigan, hot summers cold winters so was thinking 10w40 might be the way to go.
Thanks once again,
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  #2  
Old August 4th, 2006, 04:01 PM
robisonservice
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John Robison
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I suggest Mobil 1 synthetic gear lube for the axles and Mobil 1 5-40 truck for the engine. Amsoil is a good product too, but we use Mobil 1 because of greater acceptance and availability.
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  #3  
Old August 4th, 2006, 07:05 PM
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Phillip
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mobil syn in the diffs and t-case and 10w30 in the motor. mobil i guess is pretty good stuff, you can get it almost anywhere. I might try something different in my t-case soon.
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  #4  
Old August 5th, 2006, 03:09 AM
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Barry O'Mahony
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Quote:
Originally Posted by robisonservice
I suggest Mobil 1 synthetic gear lube for the axles and Mobil 1 5-40 truck for the engine. Amsoil is a good product too, but we use Mobil 1 because of greater acceptance and availability.
How about the T-case? It's an expensive puppy.
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Old August 5th, 2006, 10:19 AM
Eric Siepmann
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Eric W. Siepmann
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I would say whatever gear oil you can get. I've changed the dif's twice this year. Unless you have breathers or put one atmoshere of pressure to keep water out, syn is going to be expensive especially if you change it frequently.

1040 works great but I like to change weight with the seasons. I use syn in the engine.

EwS
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Old August 5th, 2006, 01:44 PM
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Marc
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Amsoil synth. all around, since birth.
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  #7  
Old August 5th, 2006, 01:45 PM
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Chris Davis
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Just to be clear, the first number 5W, 10W ect. is the viscosity measured at sub zero temperatures--I believe it is in the -20C range. The other weight, 30, 40 ect. is measured at 100C which is about running engine temp-ish. For cars with some oil pump concerns, I used to run 5W40 or 10W40 but most my stuff has been 10w30 mobile 1 'cause that is what I have had around lately. There is a good explainatory web site at: http://www.bobistheoilguy.com/visc.html

Chris
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