Being relatively new to owning a vehicle, and currently on my very first truck of my own, I'm trying to do everything right to make it last as long as possible. Anyway, I've changed transmission fluid, spark plugs, and I change the oil ever 5,000 km. On my last oil change I bought a case of Mobil 1 directly from Esso here in town. I threw it in and was reading the bottles when I noticed it said "recommended for newer vehicles still under original OEM warranty". My truck is hardly under original warranty so I inquired to a few local mechanics about what mileage is a good time to start using "High mileage" oil. Every single mechanic I talked to said they've never used it and don't believe in it. "Oil is oil, just use a good quality brand like amsoil or mobil 1 and you'll be fine. Don't buy into that 'high mileage' b.s." is pretty much the response I got. So my question is - anyone here use high mileage oil? Any proof that it's actually worth using it or is it just a label used to sell more oil? Also, anything wrong with using oil "recommended for newer vehicles under original warranty" in a truck that has over 180,000km on it?