Woah, this is interesting - I used some fresh veggie oil to rub down some of the underside of my 240D while I was inspecting the undercoat and I wondered if any of the “rustproofers” our there use a veggie based oil coating because it might prevent the problem of rubber swelling? That would be because the veggie isn’t petroleum based though, right? So it’s essentially “rubber safe,” right? If so, I know what’s going on the underside of my car!!


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