1997 Montero with 3.5L motor, 189,000 miles.

Is it worth it to replace the stem seals and valve cover gaskets with mileage this high? Everything else is in good working order but driving in traffic is a bit shocking, especially for those right behind me. Quite the smoke show upon acceleration.

If I do this, what else should I knock out at the same time?

Thanks,
Mark

97 Montero
90 4-Door Montero RS -- R.I.P.