There have been many discussions in the lubricants industry concerning the issue of back serviceability. The debates take place at industry meetings, in online consumer forums such as Bob Is the Oil Guy and within trade associations. It makes sense that this would be a never-ending focal point; engine oil specifications are always developed for the newest vehicles, but they are always far outnumbered by older models, which also need to be protected. Marketers, additive companies and original equipment manufacturers know their brands are at stake if widespread oil-related failures occur.
Stakeholders spend plenty of effort devising methods to prove that new oils will work in old engines, but it appears that proof is becoming more elusive. So how can the industry move forward with confidence that oils on the shelf now can be safely used across the full age spectrum of todays car parc?