I'm not sure what has changed but have used synthetic fluid in various cars since 1978 without issue. I have a car which has silicone fluid since 2001 and zero leakage/issues.
I've heard stainless steel sleeves and the new seals are the issue. I believe most if not all rebuilders will not warranty due to leakage issues.
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Steve Shauger
The Supercar Registry
www.yenko.net
Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website:
www.vintagecertification.com
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