Motor oil for an original motor?

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**Salvatore** · #1 12-11-2007, 07:31 AM

I use Rotella-T in my Z and also in my survivor SS nova. I believe that some of the experts don't recommend any synthetic for the rear or trans. I use any good 85-90 in the trans and rear. I use 15w40 Rotell-T in the Z and the nova. You can also use some of that GM posi fluid if you want.

RamAirDave · #2 12-11-2007, 07:59 AM

My 70Z is a 57K mile, unrebuilt engine. I run GTX in it, but Rotella should also be fine.

The main concern with the lack of zinc in today's oils is with cam break-in, which obviously isnt an issue with your car.

For the trans and rear, good old 80-90 gear oil will be fine.

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