2011 Infiniti G37 - 95K miles. VQ37 engine.
Service intervals since 60k has been synthetic 5W30 (either Mobil 1 or Amsoil XL) at 5K intervals. Prior to this, the service history showed 4-6K drains with conventional oil.
The valve covers were removed to replace the gaskets. The valve cover gaskets have been sleeping a significant amount of oil for the last 10K miles. When handled, the old gaskets felt a bit stiff.
Service intervals since 60k has been synthetic 5W30 (either Mobil 1 or Amsoil XL) at 5K intervals. Prior to this, the service history showed 4-6K drains with conventional oil.
The valve covers were removed to replace the gaskets. The valve cover gaskets have been sleeping a significant amount of oil for the last 10K miles. When handled, the old gaskets felt a bit stiff.