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I have a 2011 4 banger with 5 sp. manual trans. I am going to be towing a 1200# camper, and wonder if I should switch to synthetic manual trans oil as well as rear diff. oil. If so, any suggestions for brand. Also, is there a temperature sensor that can be used on the trans so I can keep an eye on trans temps?
 

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Tow capacity is 3500 lbs. on the 2.5L model, so your truck should be perfectly fine as is. I've never heard of anyone using a trans temp sensor on a manual transmission and I really wouldn't be concerned about it. I wouldn't worry about the trans oil nor the rear diff oil. Just hook up your trailer and drive!
 

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How many miles do you have on your truck?
 

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How many miles do you have on your truck?
This is the only reason "milage" would I consider replacing the oil in the trans or diff...

And as commented there is no reason to watch the temp on a manual trans, there is nothing more in there than splash lubed gears...
 

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Since changing the rear differential fluid is simple. I would change it. I like Amsoil, I buy it from a supplier from here on the forums.
 

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I use syn when ever I can. But often due to $ or availability I'll use ol dino oil. More important to be fresh IMO.

Watch the GL rating with the trans. 4 not 5.
 

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... should switch to synthetic manual trans oil ....
If your owner's manual calls for a GL-4 Grade lubricant, do not use a GL-5 with the assumption that it's better. GL-5 Grade lubes contain an additive package which will attack soft yellow metals such as copper, brass and bronze in transmission components such as synchronizers. If your transmission isn't engineered for a GL-5, stick with GL-4.

I made this mistake with an old car and the ill effect on shifting was almost immediate. Fortunately I learned of my mistake, dumped the GL-5 and refilled with GL-4.

There are some GL-5 lubes that claim compatibility with GL-4s, but I don't have the knowledge to address. I changed my Frontier's 6M GL-4 transmission oil with Nissan-brand GL-4 fluid and have been very happy.
 
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