Which type of motor oil should i use on a jeep wrangler 2000, 6 cyl, 4.0 liters with 90,000 miles?

I am using 10w30 right nowWhich type of motor oil should i use on a jeep wrangler 2000, 6 cyl, 4.0 liters with 90,000 miles?
go 20w-50





use one of the 4x4 synthetics





or just use amsoilWhich type of motor oil should i use on a jeep wrangler 2000, 6 cyl, 4.0 liters with 90,000 miles?
10W30 if the temperature never gets below 0F. 5W30 if it does. Don't listen to these halfwits who tell you to use 20W50. It takes longer to get flowing when you start up, doesn't protect any better, you don't get as good a flow and it doesn't get into tight clearances as well. Heavy oil can raise oil pressure in worn engines, but it raises it by resisting oil flow. That means the pressure gauge looks good, but you're getting less oil to the parts that need it.
10w30 is fine 5w30 would probably be better. Depends on where you live.
I have always used Quaker State 4x4 10-40 on my rockcrawler.





I live in the Bay Area so weather is generally very mild from 50-70 degree's
it depends on the climate where you live..


don't use the synthetics unless you want to see it start leaking.





i like valvoline... anything but pensoil
yep try synthetic 20w-50 unless you live in area that is really cold most of the year then maybe a 10w-40. remember she has some miles on her so i think 10w-30 is a bit thin but it will give you better mileage.

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