The BMV has been in use by many for quite a while and remember your only changing half at a time so whatever you choose will be fine but stick to same perhaps. Changing more regularly just makes sense given we don’t really know the quality of the filters in OEM and aftermarket pans going on. If you DIY then you realise the rear solenoids are quite high hence the fluid level setting is critical to get cover on them. I did mine at 72k and 110k (Mainly as had to replace pan leaking at the plastic thread) and it just looks new after towing most of its life). So after two changes I am 75% BMV and the rest old original lifeguard mix.
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