Oil Change recommendations

OK, I have the GTS manual but am looking for some recommendations for type, weight and such. I am due a full fluid change on motor, transmission, and diff. What do you guys recommend? I have the 4.6 motor as well. Seems like I recall Gary recommending something like 5W 30 for these motors? I also am going to try the tranny change hoping it will help #3 engage easier. Has anyone used the Redline ShockProof for this? So, let me hear it for motor, transmission and diff please.....

I just wanted to keep it simple so I put Amsoil 5w40 in my 5.0 seeing as that's what I run in my Corvette. My log book had everything from 5w30 to 15w50 in it ranging from quaker state to mobil 1 etc.

For the trans I'm running Amsoil sythetic manual synchromesh trans fluid and Amsoil Severe Duty duty 75w110 for the rear.

I changed it all last fall and will change it all over the winter. I figure I'll swap fluids once a year.

In my book, thinner motor oil is good for increasing gas milage. Since I'm not really worried about that facet while racing, I use 10- or 20-50 in my 5.0 l motor. At the elevated oil temps that we see while racing, I think the heavier viscosities protect better. I do change the motor oil after about three hours on run time. If the oil starts to break down, then at least it has fresh fliud pretty often.
I use stand syenthic transmission and differential fluids, and I change them during the off seanson. I don't know the viscosity of the AFT, and I think the diff gear oil was 80-90.

^ FYI I've never seeon over 230 oil temps in my Panoz and that was at Viperdays with around 100 degree ambient temps! They stay downright cold compared to a Corvette.

I agree on the oil temps. Here in Texas during August, I never got over 230 degrees. That is on TWS which is very hot and fast (1/2 mile front straight). I also heard that the 4.6 runs very hight pressures cold and not to go too heavy on the viscosity for risk of damaging the oil bypass and such.

^ That's why we said F the 4.6 and went 5.slow :D I had a '97 Cobra for 5 years. Motor is huge, parts are expensive, and aftermarket selection is far less. Too much complicated crapola on that motor.

But that said I always ran 5w30 mobil 1 in my Cobra.

I agree on the oil temps. Here in Texas during August, I never got over 230 degrees. That is on TWS which is very hot and fast (1/2 mile front straight). I also heard that the 4.6 runs very hight pressures cold and not to go too heavy on the viscosity for risk of damaging the oil bypass and such.
Even at 230 that 10-30 starts to run like water. Put it in a pan and heat it up to watch the viscosity desrease.
I suppose it's the start up pressures that cause the problems. Good to know about the 4.6. I ran 20-50 in my '02 Z06 to combat the high temps. I would see 300 F on a regular basis, and have to slow down to allow the motor to cool down.
I hope the 5.0 likes the 20-50 because it just got another fresh 6 qts.