My beloved 3.4L taco has developed a leak at the valve cover. It drips right onto the manifold, causing it to smell like burning rubber all the time. I want to change the gasket asap but at the same time I am moving across the country and have no choice but to drive it first. Is there an OTC oil additive I can add to put a band aid on the problem for now? Or should I just keep adding oil to it as I drive? I have read concerns that some of these products soften and swell other seals in the motor which may be bad.