I’ve got these ramps. They are low enough profile to get the ND on.
I just do one end at a time.
Most corrosion comes from neglect and lack of cleaning. Washing the engine bay and underside after winter helps a lot.
The oldest NDs are 2016, are we seeing any horror rust stories yet?
Most corrosion on Mazda’s comes from low corrosion resistant steel in very thin sections having no effective coating. Who washes the inside of their sills which have only a thin coat of primer from the factory ?
Yes you are correct there.
However the average ND owner keeping it for 2,3 or maybe 5 years, it simple isn’t economically worth rust proofing.
If you’re keeping it for a long time, then definitely.