i've been using idemitsu mineral 15w40 all these while. only the recent oil change i try to use shell helix plus 15w50
the differences between these two that i can tell are:
- the shell helix plus gave smoother operation, slightly less jerky during gear change (dunno how it relates to gear changing)
- more stable idling rpm after 'merembat'. usually the idemitsu i had will have shaky idling, but the shell does not although the rpm will drop to 400~500rpm.
- the shell helix plus has LESS OOMMPHH for vtec sound compare to the idemitsu mineral, but the rpm climb is smooth enough i think.
one thing i have noticed with the idemitsu...after new oil change, the engine tend to consume fuel slightly a bit more...but the consumption gets better if after 5000km (measured using odometer trip). kinda weird, coz usually this is the time for new oil change.