hmm i always used 10w30 and napa gold.....

where do i find this rotella t6? i didnt see it at napa when i was there

wonder if that will work with my cj5 with the 258 straight six

i was told to go with 20w50 for that

 

Is rotella a synthetic oil?

 

the rotella 10w30 t5 is a synthetic blend, keep in mind that diesels oils already have more additives that standard conventional... the t6 is a full synthetic.

 

T1 = Monograde conventional
T3 (aka Triple-T) = conventional (10W30, 15W40)
T5 = available in full synthetic (0W40) as well as blended (10W30)
T6 = full synthetic

 

Straight from the manual as salad said:

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

 

I have a 2000 tho the engine is different I wi try 10w-40

 

Ain't any different inside. clearancs are all the same. . 10 vs 15 is NO difference in oil ....

 

Keep in mind the manual Cruiser has is about 25 years of engine oil technology out of date, though the engines are almost identical. What matters is the startup viscosity - at the time, synthetics were unpopular, and in general oils did not wear as well. There were also issues with heavy amounts of VIIs breaking down and behaving unpredictably - your oil would thin out before it thickened! A lot has changed since then, especially in synthetic land, you can run a weight like 5w40 across the entire temperature range.

If you want to read more check out http://www.bobistheoilguy.com/motor-oil-101/ This will explain how SAE grades are measured and what they actually mean.

 

Correct. What the manual does indicate is that a ton of you guys are really overthinking this oil viscosity ****. The 4.0 doesn't care about oil. It cares about filters.

 

Yup. It's really easy:

- Needs flow at all temperatures: SAE50 doesn't work when it's -40 out, and FRAM filters won't work when its +/- anything
- Needs zinc
- Needs to be clean

 

Ok so what oil has a good zinc content? I was thinking about trying mobil 1 10w-40 synthetic and a wix or mopar filter

 

Rotella

 

You can find it at Walmart for really cheap.

I run Rotella T6 in my XJ and my Subaru 2.0t RS.

 

Rotella and Napa Gold.

 

Still running Penz-oil 5-30 along with some MMO but use NAPA or Purolator filters.