We are sorry to bring it to you, but contrary…
Modern car engines perform in very demanding conditions, such as extreme temperatures, exhaust gas after treatment systems, smaller oils sumps, and designs involving pump injectors, and turbochargers.
In the long term, some oil degradation is unavoidable, even when highest quality synthetic base oils and advanced additive packages are used. Over time, the elevated temperatures and oxidation reactions can lead to increase of viscosity. The oil may become less pumpable, which may lead to wear of metal parts. Another result of oxidation is the formation of sludge, acids and deposits, which will also lead to wear.
As a conclusion, extending the oil drain above the recommended limit may seem to provide a short-term gain, but involves the risk of component damage, high costs and sometimes even loss of warranty.