I know this is an old thread, but I have a question regarding oil changes with an oil cooler. I installed my oil cooler with inputs facing up while running the ester oil. I plan to switch to Mobil 1 synthetic on my next oil change. As I understand it from this thread, a quart or so of oil will remain in the cooler, so I will have a quart of old ester oil in my system when I make the switch to synthetic. Will it be ok to have the mix like that?
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