| 摘要 |
<p>A method of operating an internal combustion engine comprising a valve train, comprises: (A) operating said engine using a normally liquid or gaseous fuel; (B) lubricating components of said valve train using a solid film lubricant; and (C) lubricating said engine, including said components of said valve train, using a low-phosphorus or phosphorus-free lubricating oil composition.</p> |
