In the days of my E30 325i M sport when they didn't have undertrays I sucessfully managed to crack 2 sumps simply due to the low ground clearance and some undulating ground.
In the end fitted an M3 sump guard, which actually looked like a load of ski's on a frame, downside was it used to scrape on a lot more stuff as it was slightly lower but no impact or detriment to any other components or sumps anymore!!
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