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I have the same question - drive 5kmi per year in the northeast. Do you know if anyone had lab results saying oil can be used for longer than 1 year? Same question for oil filter - does 20kmi Mobil 1 extended performance filter needs to be changed once a year (or 10kmi)?

oil companies are in the business to sell oil. I wonder if oil tests confirm 1yr/10kmi requirement. Also, like I mentioned earlier - 10kmi in Manhattan with 10kmh and on highways with 60mph may not be the same for the oil\engine and I'd assume oil lasts longer with 60mph. As far as 1yr...

I've read somewhere - once oil is out of the bottle, it's life is limited to 1 year. Is that true? has anyone tested 1+ year old oil in the lab to see if it can be used longer? It doesn't cost much to change an oil, but it usually takes at least 45 minutes during business hours.. that's why I'm...

highlander

Hi there I use synthetic Mobil 1 Advanced Fuel Economy oil and Mobil 1 extended performance filter (20kmi, 1yr) Car manual says I should change oil and filter ever 10kmi / 1yr. I usually drive just under 5kmi a year. Do I still have to change oil once a year? Do I also need to change 20kmi...