Originally Posted by
Transporter
I know you did the UOA only to know if, the oil could last 15,000km in your engine the way you drive and you know that everyone drives differently and use the car differently. Even if you have your oil analyzed, unless you drive under the same condition all the time, you can't extend the oil changes without monitoring the oil on regular basis, the reason for that is that any changes in your driving (a few short trips for example) and your aged oil will not be able to protect your engine and any saving will be very short lived.