Bought new 2016 Cherokee is it worth shooting the under carriage with oil (for winters)
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In my opinion I would NOT recommend it.
This Cherokee and most if not all vehicles are corrosion protected at the manufacturing point during the manufacture process.
Cars of today just do not rust like they did years ago. The all have nice corrosion warranties on them. Jeep seems goes the extra mile in this area.
Now my main concern is that using an undercoating or oil will block factory designed/built in drain holes and points.
If water or moisture gets in behind that "shield" it has no place to go, you will very likely compound the issue.
Use of oil, designed for this purpose, will still attract dust/dirt and hold it. Again moisture being trapped behind it will be an issue.
Also I would imagine that a good undercarriage wash could do some damage to this form of "shield" by washing it away in parts.
You do want to wash frequently during the winter.
So in my opinion I would advise a good touch less car wash during the salty winter times. A wash that includes a good undercarriage wash. You will need to run it through anyway to wash the vehicle, especially the paint. Paint can be damaged by enough salty spray etc. Also it is advisable to put several coats of a good liquid polymer wax, like Turtle Wax Ice or Meguiars on it before winter. Those are just my favorites.
Come spring you can manually touch up any rust spots from things like stones and any nuts or bolts. I use a brush on rust neutralizer where needed and top coat it if needed with some paint in a day or so.
I just consider that normal maintenance that may not even be needed for the first 4 years or so.
I also usually wash the underside in my driveway in warmer weather to keep it free of dirt etc.
I have had 3 of my 4 Jeeps spend their winter days in the Chicago area. They used salt very heavy also.
But again you can use oil or undercoating. There are some that swear by it. But again if issues develop it will be years down the road. And depending on how it was done it could void the rust warranty.