rotella,once more?
#3
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Join Date: Jan 2017
Location: usa
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Year: 2000
Model: Cherokee
Engine: 6 cylinder
Wallyworld does seem to have the best Rotella prices. Problem is around here they don't stock a lot of different weights.
The 'T6' is full synthetic, the 'T5' is synthetic blend which i've been using.
Might upgrade to T6 next oil change to see if it improves oil psi better in hot weather.
I use 10w-30 in Winter and 15w-40 in Summer.
I personally stay away from straight weights.
The 'T6' is full synthetic, the 'T5' is synthetic blend which i've been using.
Might upgrade to T6 next oil change to see if it improves oil psi better in hot weather.
I use 10w-30 in Winter and 15w-40 in Summer.
I personally stay away from straight weights.
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#8
CF Veteran
4.0s run fine on a 40 weight oil, I believe that is what they originally called for, diesel oil has additives that help prevent wear better on flat tappet engines then modern gas engine oils do.
#12
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Jeep Engine Oil Viscosity
This was taken from pages 82 and 83 of the 1989 Chrysler/Jeep owners manual.
Selecting Engine Oil Viscosity
When changing or adding engine oil select the proper grade by using the chart on the following page. Select the grade that corresponds to the ambient temperature range you expect to encounter before your next oil change.
30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30