With that information Jack, i'd suggest keeping an eye on the oil level and when it drops (if it drops) top up with some Carlube ATF-U to help clean the engine internals, revive the oil seals and help your hydraulic tappets to stay quiet.
I suspect the oil/filter changes have been neglected more than somewhat so you may find for the first year or two you need to change the oil more frequently than you'd expect, just to keep it clean.
The Petronas is a good oil, i know several people that use it, if i had an engine that called for it then i'd probably use it as well. Mine need a 10W40 semi-synth so i use Gulf which so far has done very well but as a friend put it, "smells a bit 1969" because it's a bit pungent (not as bad as Castrol GTX though!) although not as nostril-achingly pungent as Castrol!
Glad you seem to have it sorted!
PS - i always thought TJ Filters were a sub-brand of Fram, don't know why!
