[projectRDM]

Johnny5- 158 isn't terribly bad, but in colder weather it may drop more, anything below say 140 and the ring/piston and cylinder tolerances are a little off because they're not up to operating temperature, which will cause a lot more blowby than normal.

Bradman123- the OE gauge is known for it's inaccuracy, middle way on the gauge is anywhere from 160-230, it won't show hot until you're already boiling off water. Get a real gauge to insure you don't damage something.

qvester- after a run down the freeway you should have seen cooler temps, double check the cooling system for air pockets or worn parts, unless you were running in a lower gears, turning more rpms, you should have been running about 185-190.