V Twin:
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Your Isuzu dealer/service guy/whatever ..... needs to change brands of coffee.
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The VX trans does have a filter ........ some call it a strainer ........ whatever. Maybe he told you this because the techs don't feel like removing the crossmember and dropping the pan to change the fluid and filer ............ hey - at least they don't have to remove (part of) the exhaust system ......
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Your 'maintenance list' is a good one ..... you may want to add coolant change to this list ....
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The fuel filter should also probably be changed at this point ....
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hopefully, the air filter element has been changed .... a few times ... if not, add this to the list ...........