2009 GCV SE
How does one tell if it's bad based on odor? My F150 oil starts to smell like a mixture of fuel and oil towards the end, which definitely isn't good but what else?Color, not so bad, but an odor change isn't good.
Some oil changes color really quick, Mobil 1 being one of them I believe. Depends on the additives in the additive package for starters.