At what specific percentage of oil life should I consider changing my vehicle’s oil to ensure optimal performance and longevity? Is there a universally accepted threshold, or does it vary depending on the type of oil used, the vehicle’s make and model, and even driving conditions? For instance, does synthetic oil necessitate a different change interval compared to conventional oils? Furthermore, how can one accurately ascertain the remaining oil life, and are there particular indicators or tools that might assist in this evaluation? Could it be prudent to adopt a more proactive approach and change the oil at an earlier percentage, say around 20% remaining, to mitigate any potential risks? Or might this be an unnecessary precaution that leads to an increase in maintenance costs? Ultimately, what factors should be paramount in making this pivotal decision regarding oil change intervals, and how can one ensure adherence to best practices?