New to the forum. Just bought an SSR. It only has 14K miles on it. We just got it on a lift for the first time. Transmission oil is black. Probably never changed. I haven't look at the differential oil. Probably black too. The SSR didn't come with an owner's manual. I have one on order, but it will be several days before it arrives. What's the best lube oil for trans and diff? Help appreciated.