Wait, did you say you’re running 87 octane in a type S?? Those have high compression engines and need 91 octane to prevent detonation and possible engine damage. These poor Hondas were so masterfully engineered and constructed only for silly kids to neglect oil changes and force lean AFRs with dumb CAIs and/or race exhausts without properly tuning or monitoring data.. A maintained rsx S should easily make it past 250k miles without any significant work.. I neglected my 03 for a good couple years.. blew a head gasket, overhauled, still driving it like I stole it- but now she is well maintained. Almost 250k on the odometer, picked it up from the original owner over 100k ago who was a grown up and followed service intervals.