to share experience.. when I got my Syncro tintop 5 years ago it has an
unknown age rebuilt engine... and I feel it's quite underpowered compared
to my Carat because the Syncro is heavier...

so after 6 months of ownership I considered a new engine... I even ordered
one from Vanistan but then canceled the order.. the idea is just wait and
see... I learn to live with it and I add an external oil cooler.. a little
experiment of my own... wait till it dies and replace...

it's still running... and I am still waiting.. off-road and long distance
travels and all... and it's still refuse to die...

as a joke a friend asked "you want a new engine? take out the oil and drive
3 times around the block and you will need new engine..."

:-)