After seeing Amsoil getting beat up on another thread, I still had many questions, so I thought I'd ask what you guys use regarding crankcase oil for your ride-on's as well as the trucks used to transport them (gas & diesel). I searched, but could not find a previous thread...hence this post. (I have my preferrences, but I'd like to learn from your experiences). 1) Synthetic vs conventional. 2) 5W vs 10 W and what time of year to switch (if you do). 3) Is changing oil & filter on a regular basis a good idea -- even if you use products such as Amsoil, etc that offer extended oil changes ? 4) How important is it to change oil on a regular basis due to dirt & debris? 5) Any difference in oil pressure with full synthetic vs semi-synthetic or conventional oil? 6) Which brand of motor oil do you prefer? 7) Do you use different motor oil in your small engines vs your trucks? 8) What is your favorite brand of motor oil? 9) Do you use synthetic or conventional products regarding tranny, transaxle, grease, etc)? Thanks, rscvp.