1. My Kohler owners manual shows the oil filter as Part # 12 050 01-S. My dealer gave me a filter with Part # 52 050 02-S. CODE 334 Is this the correct oil filter? 2. My mower owners manual says to change the original engine oil after the first five hours of operation. I do not see where it says this in the Kohler Owners manual. What does Kohler recommend? 3. I am a little confused about the engine oil. Is it OK or better to run a synthetic 10-30 oil or does Kohler recommend a regular 10-30 oil? 4. The Kohler owners manual says to use unleaded gas 87 octane or higher. The mower manual says not to run a premium gas. What octane range does Kohler recommend?