What oil should I put in my lawn mower to ensure optimal performance and longevity of the engine? With various options available in the market, how can one ascertain the most suitable type for their specific model? Does the choice of oil, whether it’s conventional, synthetic, or a blend, significantly impact the mower’s efficiency? Moreover, could the viscosity rating, such as SAE 30 or others, play a crucial role in its operation under varying weather conditions? In addition to selecting the right oil, how often should one consider changing it to maintain peak performance? Is there a difference in the recommendations for different brands of lawn mowers, and how do seasonal changes affect the oil’s efficacy? What about formulation specifics, such as additives that enhance performance? Lastly, are there any environmental considerations or regulations that should influence one’s choice of lawn mower oil?