I just bought a cherry Enclave with only 28,000 miles. I love it but the transmission shudders between gears. Has anyone tried an additive like ProLong PSL15000 or a Lucas product for this problem. Does anyone think it's a bad idea to try it? It's a top rated tyranny additive but I don't know if I want to try it or go back to the dealer. Still on warranty so ...
Thanks
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