Wilsonrl48747 0 #1 Posted July 4, 2009 Hello there. I have a C120 with the 12 horse Kohler and was wondering about oil type to use. The manual says 10W 30, but I wanted to know if anyone was using straight weight oil or heavier oil to keep the older engine happy. I don't work my tractor to death, basically mowing 5/8thacre and some plowing/snowblowing in the winter. A guy I used to work with said its better to have the straight weight oil without all the cleansers etc which makes sense, and I used that on an old crummy sears tractor I had cuz I didn't care much about it. But I love my WH and want to keep it around as long as possible. What is the best thing to use? Thanks much Share this post Link to post Share on other sites
Jim_M 178 #2 Posted July 4, 2009 I use Shell Rotella T straight 30W in all of my small engines in the summer and Rotella 10W30 in the winter, never had a problem. I think 10W30 is recomended for temperatures below 32 degrees and would be too light for summer use. Share this post Link to post Share on other sites
