Improved Oils and Engine Technology Make Extended Drain Intervals Advisable for Quick-Turnover Fleets w/ Close Monitoring

Background
Oil change required before fail­ure defined as:
Dis­per­sant addi­tive over­loaded w/ soot; fil­ters plug; vis­cos­i­ty increas­es; excess heat trans­fer via oil caus­ing oxi­da­tion;
acid lev­el too high; pis­ton deposits block oil flow; car­bon packing/ring scuff­ing; pin bore deposits stop pin rota­tion; anti-wear addi­tives deplete