[fsSnowboard]

I use Mobile 1 10w30 full synthetic.

[Trendsetter75]

Thanks guys I think Im going to use Valvoline 10w 30 non synthetic with napa filter.

[jutgin]

I wanna tag onto this thread, whats the deal about royal purple? I couldnt find it at the local parts store O'Reilleys.
Is it really purple? A buddy of mine says it is.
I'm intrigued.

[john NC]

formula shell 10w-40 right now, got a free case from someone who bought the wrong kind

usually whatever name brand 10w-30 dino i can find a good deal on and a purolator pure one filter

[Bubba3200]

Rotella......15-40....The jeep likes it!!

[JBTJ]

Originally Posted by jutgin

I wanna tag onto this thread, whats the deal about royal purple? I couldnt find it at the local parts store O'Reilleys.
Is it really purple? A buddy of mine says it is.
I'm intrigued.

It's just a die that is added when manufactured. Looks cool I guess. When you drain it out after 3k it looks just like any other oil. Same as any other oil. Marketing hype is all that stuff is.

[Divinitous]

Mobil 1 Full Synthetic 10w30 w/ Napa Gold 1515 filter.

[BriansCJ]

Originally Posted by Jerry Bransford

If it was -15 and I was in Buffalo NY or Grand Forks North Dakota, I'd run a 0W-30 full synthetic. Since I don't and I wheel in temperate conditions, I run a non-synthetic Valvoline 10W-30. The only thing I run synthetic in any more is my automatic transmission (ATF+4) and in my transfer case. I'll never run a synthetic gear lube in my axles, I personally believe (after some surprising findings by companies like Currie) a mineral based GL-5 or GL-6 gear lube protects the ring & pinion gears better.

Thats good to know Jerry.

OP In all of the Jeeps, I use Castrol GTX 10w30.

[BubbaGoose]

If it needs oil
it gets Royal Purple.

[2006_Sport]

Originally Posted by Jerry Bransford

If it was -15 and I was in Buffalo NY or Grand Forks North Dakota, I'd run a 0W-30 full synthetic. Since I don't and I wheel in temperate conditions, I run a non-synthetic Valvoline 10W-30. The only thing I run synthetic in any more is my automatic transmission (ATF+4) and in my transfer case. I'll never run a synthetic gear lube in my axles, I personally believe (after some surprising findings by companies like Currie) a mineral based GL-5 or GL-6 gear lube protects the ring & pinion gears better.

Why does Jerry know everything? haha

Just the standard mopar crap in the tranny, engine, gears

[SilverBullot]

Castrol Edge 10W-30

Think with your dipstick Jimmie!

[Xlr8n]

I use Mobil 1 High Mileage 10w30 for three reasons:

1) It offers the protection and extended service of a full synthetic oil.

2) It is the viscosity rating recommended by Jeep.

3) It offers the level of protection that the 4.0 was designed to run on. More specifically the additive package of ZDDP (zinc phsposhate). As of my last research on the subject, every other full synthetic in 10W30 has ZDDP levels at the newer, yet much lower, 'emission compliant levels' of 800 PPM instead of the older 1000+PPM that the engine was designed around. (Higher offers better wear protection.)

Tons of info available on the web on the subject for those interested.

Here is the table listed ZDDP and Phosphate levels that Mobil refers folks with inquires of concern of use of newer oils in flat tappet engines: https://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf

[TravisHeim]

My last oil change I put in Valvoline full synthetic 5w30, and it was a noticable difference in cold NY weather from regular 10w30. If I can actually remember to PM the amsoil rep before I need to do my next oil change I'll be running amsoil 0w30. Otherwise I'll look for Valvoline full synthetic in the 0w-30 flavor.

[hoosier724]

this topic should be banned unless the poster has used the search!

[TheBoogieman]

Originally Posted by 2006sport

Why does Jerry know everything? haha

He is the King.