ok the only dumb question is one that is not asked. I'm new to having an engine with a medium cam. My motor is a 318 magnum with a purple cam. I bought my 66 valiant with this setup installed. It is time for me to do my first oil change on this car. I know I want an oil with a high level of zinc. My question is what do others recommend? I'm not racing but do a lot of freeway driving. Right now I have 5 quarts of Rotella T 10w30. I have never used Rotella in a vehicle before. Will this oil be sufficiant or should I go with something else? Thanks in advance for any input on this thread.