Hello Everyone, Just joined the forum last night and hope to share the best of my knowledge and experiences with you. Last week I drained the manual transmission oil (first since 2000), flushed it and filled it with Shell Helix Ultra 5w40. Transmission runs flawless, fuel mileage improved until the operating temps and overall cruising noise is lower then it used to. What do you all think when it comes to using synthetic 5w40 oil in transmission? How long can I run this group 3 oil in the tranny? Would you actually consider using a group 3 synthetic oil instead of Honda MTF? This is my fist post and hope to have an effective & short discussion. Thank you all.