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Jul 20, 2012 | 06:48 PM

pelexj90

Thread Starter

Junior Member

Joined: Sep 2011

Posts: 98

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From: RI

Year: 96

Model: Cherokee

Engine: 4.0 baby

best synthetic

looking to start running synthitic in my jeep its a 4.0 with 193k jw what some of the best ones to use would be?

Jul 20, 2012 | 06:52 PM

UsmclovesXJ

::Regional Moderator::

Joined: Aug 2011

Posts: 4,742

Likes: 10

From: Jacksonville, NC

Year: 1993

Model: Cherokee

Engine: I6 4.0L HO

Castrol gtx high millage 10w-30
And 1 Lucas.

Jul 20, 2012 | 07:07 PM

dylanXJ99

Member

Joined: Apr 2012

Posts: 161

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From: Roanoke VA

Year: 99

Model: Cherokee

Engine: 4.0 I6

I am a fan of royal purple. I was sponsored by them for my high schools engine building team last year and they make a great product if you ask me. My first oil change ever in my jeep was royal purple. Only problem...it's EXPENSIVE!!!!!....haha about 10 dollars a quart depending on where you shop. Needless to say, I'm not running royal purple no more. But it is a nice product. Plus it's purple. No lie lol

Jul 20, 2012 | 10:25 PM

SiRed91

Member

Joined: Jan 2012

Posts: 188

Likes: 1

From: North Salt Lake Utah

Year: 1994

Model: Cherokee

Engine: 4.0

Valvoline SynPower

Royal purple has problems.....do some research

Jul 20, 2012 | 10:43 PM

wifin

Seasoned Member

Joined: Nov 2011

Posts: 448

Likes: 0

From: Falls Church, VA

Year: 2000

Model: Cherokee

Engine: 4.0 I6

First off...there are TONS of threads about oil on here. But alas, might as well answer

I would actually say Rotella 10w-30!!!

Has a high level of Zinc, and a great cleaning oil. Also good price.
Unfortunately they don't have as much zinc as it used to. But it still has a better amount than the common oils

Jul 20, 2012 | 10:50 PM

UsmclovesXJ

::Regional Moderator::

Joined: Aug 2011

Posts: 4,742

Likes: 10

From: Jacksonville, NC

Year: 1993

Model: Cherokee

Engine: I6 4.0L HO

Quote:

Originally Posted by SiRed91

Valvoline SynPower

Royal purple has problems.....do some research

X2.

Jul 20, 2012 | 11:50 PM

EVILXJ

CF Veteran

Joined: Mar 2011

Posts: 1,273

Likes: 1

From: South Bend, IN

Year: 1995

Model: Cherokee

Engine: 4.6 stroker

im going to go with amsoil after my motor is broke in

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Jul 21, 2012 | 01:11 AM

emptypockets

::Regional Moderator::

Joined: Jul 2011

Posts: 2,912

Likes: 6

From: Over here...

Year: 1986

Model: Cherokee

Engine: 2.8

At 193k, I'd just stick to regular old dino juice.

Jul 21, 2012 | 09:08 AM

Outlaw Star

CF ADMIN

Joined: Sep 2010

Posts: 34,088

Likes: 257

From: Lantana, Fl

Year: 1996

Model: Cherokee (XJ)

Engine: 4.Slow

Quote:

Originally Posted by pelexj90

looking to start running synthitic in my jeep its a 4.0 with 193k jw what some of the best ones to use would be?

If the vehicle has has regular base oil its entire life then do not switch to synthetic now. Especially at that high of a mileage.

Jul 21, 2012 | 09:11 AM

#10

91 limited owner

CF Veteran

Joined: Aug 2009

Posts: 4,118

Likes: 6

From: Oshkosh, WI.

Year: 1991

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by emptypockets

At 193k, I'd just stick to regular old dino juice.

Jul 21, 2012 | 04:48 PM

#11

OEJ

CF Veteran

Joined: Dec 2010

Posts: 1,700

Likes: 0

From: S.Jersey

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Outlaw Star

If the vehicle has has regular base oil its entire life then do not switch to synthetic now. Especially at that high of a mileage.

There is nothing wrong with going to a synthetic from conventional at anytime. Milage has no bearing on the issue either.
That is a HUGE missconception. Sorry. No disrepect intended. Whats important is driving stlye vs intervals of oil change.

With that said i run Royal Purple in the front/rear diffs,the tc and now the motor. Just started with the motor about 200 miles ago. I ran valvaline high milage. the RP is only about buck difference where i am.

My top 3 favs in the synthetic world are.
RP
Mobile 1
Valvaline high milage

Jul 21, 2012 | 07:13 PM

#12

xjchris

Seasoned Member

Joined: Dec 2008

Posts: 374

Likes: 0

Model: Cherokee

Oh boy, Royal purple is bad, i switched to RP FROM mobile 1. Started ticking on start up and never went away.

I have alot of experience with sythetics in many types of engine (v8/v6/i6/i4/h4) most of them boosted. in my opinion here is what i like

1- AMSOIL-BEST MONEY COULD BUY
2-Mobile1

Most others are not half as good as Amsoil