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Q: 1) With 85000miles, how often should I change oil using mobil 1 ? (In millage)
on 2001 Toyota Camry

I always use Mobil 1 for the oil changing
Also, check engine is on, should I change oxygen sensor or the front catalyst.
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you should change your oil every 4000
mi.I would have it scan tested for codes for the check engine light on
Please what of if I use Mobil XHP or any other oil which is not synthetic, how often shall I change it, in maillage
For the check engine after diagonising it, the code is P0420 catalyst convert system efficiency below threshow (bank 1)
P0440 Evaporative Emission control system
P0441 Evaporative emission control system-inncorect flow detected.
Using Mobil 1 oil, changing it every 4,000 is over kill! I use Mobil 1 on all my vehicles, and in 20 + yrs I've never changed the oil any earlier than 7,500. More often than not I change it closer to 10,000. I've worked professionally on vehicles for over 15 yrs and have never seen an issue resulting in damage due to longer intervals like this with synthetic oil. As a side note, Mobil 1 guarantees up to 10,000 miles. I have a 2002 Honda Odyssey, (148,000 miles) 2002 Buick lasabre, 124,000 miles and a 2014 ford fusion with 72,000 miles, all Mobil 1 oil, all changed in intervals of between 7,500 to 10,000 miles. I use Mobil 1 filters too.
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