I have a L355SS and it runs excellent. I change the oil and filter every year, grease it and give it a good once over every spring. I only use it for bush hogging and only put about 35 hours it during the summer. My question is: Is it necessary to change the hydraulic fluid every year with such a minimal amount of hours of usage each summer. It has 2380 hours on it and it runs fine. I have not changed the fluid in the last 2 years and was wondering if that would cause any problems. It is kept in an enclosed unheated garage over the winter.