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Originally Posted by JLHarper
Thanks for that info, I will have to look into it.
Car has low miles and I had it serviced again prior to this trip to fix some parts that had fallen off or broken.
Seems louder now.
Is this info on the rear oil modifer in the Pontiac dealer system or coming from the owner community?
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The Friction Modifier is a required additive. I believe it's only an once or so. You can only get it through Pontiac I believe as it has it's own part number.
Here is a link to Rear End Clunking I made sticky in the GTO Forum.
http://www.gtoforum.com/f3/growling-...ng-rear-14102/
You may not experience rear end clunking but if you have a noisy rear the oil may be breaking down. My rear was changed out at 9K miles and the new rear which had only about 8 or 9K if I recall had to have new oil added.
I used to work for Dana and I can tell you Dana did not use the best oils unless a specified oil was requested by their customer.