I see the guys before me didn't answer your question <img src="http://www.aaca.org/ubbthreads/images/graemlins/tongue.gif" alt="" />, I am a service advisor for a Buick dealership, so, to answer your question anonymous man....... Marvel mystery oil WILL NOT harm your newer engine at all, in fact, it will help it, by keeping it clean and helping burn out deposits.....you found out yourself! <img src="http://www.aaca.org/ubbthreads/images/graemlins/grin.gif" alt="" /> Nearly all my mechanics use it, as do I, every other fill up! I put 4 ounces in per tank full. It will not cause damage to the injectors, sensors, converters, etc. Use it, go ahead it's good for it!! <img src="http://www.aaca.org/ubbthreads/images/graemlins/smile.gif" alt="" /> You buy it anyway,....why not put some in your newer engine??? <img src="http://www.aaca.org/ubbthreads/images/graemlins/wink.gif" alt="" /> Now,....any other questions? Have a great day and Happy Motoring!