Here in New England I run both of my cars on Redline Synthetic ATF. I've been very pleased with its performance in both cars; 4 years in the 300TE, and almost 2 yrs in the 500.

Most noticeable difference is in the cold weather...it shifts pretty much like summertime, even right when you get going in the morning.

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All the best, Michael
500E
300TE