It will vary car to car. The best is to check the owners manual, It will usually give a recommended oil for a given heat range.
Generally that will remain the best oil for the engine over its lifespan. If the engine is getting worn out (and for most modern engines 100K is nowhere near that point) going up a weight or two can *possibly* help extend the life of a worn engine. However it will reduce efficiency (resulting in less power & mpg).
let me guess a nice calm sunny weather
With that kind of mileage I would go ahead and do an engine overhaul or swap. Unless the body and running gear have been used and abused it should have another 100K left in it.
I recommend a high mileage oil such as Pennzoil High Mileage in the weight the manufacture of the vehicle recommends.
one
an abbreviated briefing.
what kind of weather dose mississippi have
The United States flag can be flown in all kinds of weather. But, this is only possible when the flag is made of a weather-proof material.
you should know! what kind of question is that
10W30
there is no weather
A Different Kind of Weather was created in 1990.
depends on the mileage.....for a 1988 dodge shadow with over 100000 miles its 5-30...to be sure either go to or call any auto parts store and have them run the information for you.