transmission fluid

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I have an 03 silverado with a manual transmission, (mg-5). The dealership say it takes a synchromesh fluid. i am tryiing to find out if it is acceptable to use a75/90 synthetic. any input is greatly appreciated.

9/20/0810:30 AM

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gurkhaMember

Synchromesh usually means oil minus damaging EP additive, in this case you can try out Chevron Delo gear oil which is EP free and uses Boron instead and is sythetic. You can also use Mobil-I synthetic gear oil.

9/20/0810:09 PM

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emMember

If it concerns the NV3500 gearbox, it's recommended to use a GM partnumber GM 12345349 (which is claimed to be a 'special gear oil'). If it concerns the NV4500 gearbox, GM's original recommendation is a GL-4 75W-85. Here you could safely use a 75W-90, if you also keep the comment of Gurkha above into account while selecting a product.

9/21/0810:39 PM

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