I use dino oil - Shell Helix 10w/30 with Mann or Volvo OE filter in my tropical climate.
I figured our B230 engine is sort of old school design which used conventional oil during its inception. It seems well suited to dino oil. I did use semi/full synthetic variety many times ago but noticed a bit of "auto transmission lag" i.e. engine not totally in sync with transmission - engine spins faster and transmission sort of catches up later. Could be specific issue with my ZF 4HP22 I don't know but I'm using ZF approved fluids.
I stopped buying Castrol or some other parts store oils which has dubious security seal. Counterfeit oil is not uncommon nowadays.
Regards,
Amarin.
p/s - To clean the engine's insides MMO is a good choice. Previously I use repeated engine oil flushing method (i.e. use new cheap oil to run in engine, change with another new oil a few days later and finally use your preferred oil) but thats wasteful for the environment. Got similar results with MMO.
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