Lots of things can happen in theat 1 year oil change.What about fuel dilution? Randomly going 12000 + kms because the oil "can" go that far, seems odd to me. I would at least get a oil analysis to check if damage is not being done to the engine. One thing to save $ but at what cost?
I did look around bobistheoilguy.com and a bunch of 1 year analysis shows that different engines cant just go that far.
I just follow my manual. 8000 kms on regular oil i get on sale. Costs $15 a change.
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