A question on transmission fluid. I know to use the ATF+3 fluid in the transmission. I can also use the ATF+4 according to what I have read. How about the synthetic transmission fluid? It is more expensive and supposed to be as good if not better. For about a dollar a quart more I can have the synthetic. Just thought I'd ask before I bought my nine quarts for the transmission. Is it alright to go with synthetic ATF+4 fluid made by a major manufacturer?