- Oct 14, 2003
- Eldora, Colorado 9000'
Found this while doing an internet search today. Perhaps BITOG members? It's a very interesting read. It's something we all ask ourselves, "how long does synthetic oil last?" They will test in order Mobil 1, Amsoil, Red Line and Royal Purple. Here's an LS1 study done with Mobil 1 5W30. The oil stays in the engine until analysis shows it is no longer safe to use. Oil Study Mobil 1 Results