On the topping-off fluid, it looks like the original 737-3055 Drive System Oil has been discontinued and replaced with 737-3120 Drive System Fluid Plus, which is synthetic. I know this horse has beaten to death, but is it safe to mix the two if I’m just topping it off when changing the filter? I called multiple repair shops and the responses ranged from “it should be fine they are the same thing” to “don’t mix them drain and replace all the fluid with the new stuff”.
I can’t seem to get a straight answer from anywhere, is it safe to mix the Drive System Oil with its official replacement Drive System Fluid Plus, or is there a compatible oil I can use instead?
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