Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 04-11-2010, 12:45 PM
New Member
 
Join Date: Mar 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dansanch is on a distinguished road
Newbie! Need Help with oil and gas choices

Hi there. Just purchased a 05 gc limited hemi with 61K miles. Just installed an Aem intake. Questions, not knowing the type of oil previous owner used, should it be ok to start using mobil 1 5w-20 or should I continue letting dealership change regular oil? Also, should I start using 87 or 89 octane gas? Feel small hesitation when cruising and hardly pushing had at around 40-55 miles/hr. Same happens if at stop pushing gas all the way in several times in a row, it feels as hesitating big time after first push of gas. There is no hesitation of engine when driving and flooring the gas though!
Just got 60k miles service from dealer including fuel injectors, spark plugs, service.
Any comments will be greatly appreciated.
__________________

__________________
Reply With Quote
  #2  
Old 04-11-2010, 01:46 PM
Long Live the Graphite Ghost

 
Join Date: May 2009
Posts: 13,394
Thanks: 54
Thanked 131 Times in 113 Posts
Rep Power: 542539
robpp has disabled reputation
Re: Newbie! Need Help with oil and gas choices

is it a 3.7, 4.7, hemi?

4.7 has a trans tsb about hesitiation. you could check if that tsb was ever applied. once past warranty, dealer charges for them......
__________________

__________________
Reply With Quote
  #3  
Old 04-11-2010, 03:10 PM
gc4x4's Avatar
Member
My Jeep: 2012 2.4L
 
Join Date: Mar 2010
Location: Hot Springs Arkansas
Posts: 693
Thanks: 0
Thanked 5 Times in 3 Posts
Rep Power: 10835
gc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond reputegc4x4 has a reputation beyond repute
Smile Re: Newbie! Need Help with oil and gas choices

If its a Hemi then its probably the mds kicking in and out that you feel.Sometimes its perceived as an abnormal hesitation but its actually the mds working, usually between 40-80 mph at a constant speed.
Btw If you do find out if the PO has been using synthetic, then you should keep using synthetic, otherwise I would use Castrol 5w20, I can swear by Castrol, Ive had no problems using it in my cars at all. Good luck
__________________
Reply With Quote
  #4  
Old 04-11-2010, 03:36 PM
New Member
 
Join Date: Mar 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dansanch is on a distinguished road
Re: Newbie! Need Help with oil and gas choices

It is a hemi. Would it hurt to start using synthetic oil at this point? I have heard that it may cause problems if an engine was using regular oil and then switch to synthetic later on.
Regarding gas octane, 87 or 89?
__________________
Reply With Quote
  #5  
Old 04-11-2010, 04:02 PM
Joe in PA's Avatar
Member
My Jeep: 2004 4.7L WJ
 
Join Date: Oct 2009
Location: Harrisburg PA
Posts: 900
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 2712
Joe in PA has disabled reputation
Re: Newbie! Need Help with oil and gas choices

If it is a hemi you should be using a synthetic 5w20 in order for the MDS to function properly. As to the octane, use whatever you can get away with and not experience detonation. Running a higher octane than your engine needs or is tuned to use is a waste of money.
__________________
01' WJ Larado - 4.0L i6
04' WJ Freedom Edition - 4.7L HO
07' WK Limited - 5.7L Hemi
09' Mustang GT - Good For the Soul

[SIGPIC][/SIGPIC]
Reply With Quote
  #6  
Old 04-11-2010, 06:13 PM
Member
My Jeep: 2008 5.7L WK
 
Join Date: Jan 2010
Location: mid-Michigan
Posts: 448
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 2121
Walt has a reputation beyond reputeWalt has a reputation beyond repute
Re: Newbie! Need Help with oil and gas choices

Quote:
Originally Posted by dansanch View Post
Hi there. Just purchased a 05 gc limited hemi with 61K miles. Just installed an Aem intake. Questions, not knowing the type of oil previous owner used, should it be ok to start using mobil 1 5w-20 or should I continue letting dealership change regular oil? Also, should I start using 87 or 89 octane gas? Feel small hesitation when cruising and hardly pushing had at around 40-55 miles/hr. Same happens if at stop pushing gas all the way in several times in a row, it feels as hesitating big time after first push of gas. There is no hesitation of engine when driving and flooring the gas though!
Just got 60k miles service from dealer including fuel injectors, spark plugs, service.
Any comments will be greatly appreciated.
First, welcome aboard.

I changed to synthetic oil at 3/36 warranty expiration. It's been Castrol 5W-20 Syntec. You can get it on sale at AutoZone in special offers. Also, it's sold in 5-qt jugs (as is Mobil-1 5W-20) in WalMart for ~$22.00 per jug. HEMI likes synthetic more than dino oil, and burns less between oil changes.

Sounds like your "hesitation" is more-or-less normal for a HEMI. Try doing it in 5th gear, not Overdrive, to see if there is an obvious difference.

You can use 87 octane gasoline, but 89 is "recommended" by Chrysler. I just buy the 89, unless it is not available. Never used 91, so I can't comment on that.

Just my "Limited" experience (pun intended)................
__________________
'08 WK Limited, 5.7L HEMI, Quadra-Trac II, Bright Silver Metallic, Class IV Hitch, Michelin LTX M/S tires, Billet Technology oil catch can, Fumoto oil drain valve.
Reply With Quote
  #7  
Old 04-11-2010, 06:42 PM
New Member
 
Join Date: Mar 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dansanch is on a distinguished road
Re: Newbie! Need Help with oil and gas choices

Thank you all for your input. I really appreciate your advise and hope to be a long time jeep lover as all of you are.
__________________
Reply With Quote
  #8  
Old 04-11-2010, 07:36 PM
Scottina06's Avatar
JeepGarage Founder
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: May 2009
Location: Berea, Kentucky
Posts: 48,731
Thanks: 816
Thanked 797 Times in 617 Posts
Rep Power: 7717295
Scottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond repute
Garage
Re: Newbie! Need Help with oil and gas choices

yep...thats the throttle lag on the hemis due to the throttle by wire. I recommend the Mobil 1 5w-20 extended performance and a K&N Gold oil filter. Ive used that combo for years on high hp engines
__________________
SCOTT
The HARDER you work...the LUCKIER you are!
2014 REDLINE red Jeep SRT "BLOODIED Edition" 1 of 1
Previous JEEP rides-
2013 Jeep Grand Cherokee SRT-deep cherry
2013 JKU 10th anniversary-white
2006 Jeep Grand Cherokee Laredo-inferno red



Twitter-The_Jeep_Guy
Instagram-thejeep_guy

Reply With Quote
  #9  
Old 05-08-2010, 11:03 AM
Member
 
Join Date: Feb 2010
Posts: 843
Thanks: 0
Thanked 6 Times in 5 Posts
Rep Power: 7859
dmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond reputedmsfun has a reputation beyond repute
Re: Newbie! Need Help with oil and gas choices

Hands down, the best oil for the hemi is Royal Purple. I used Mobil 1 and Castroil full syn, and it runs better, stronger and gets better mpg with RP. WIth gas, use 89 Octane and make sure it is not B grade; i.e., get gas from top tier stations like Shell, Mobil, Exxon, Chevron, etc... and avoid Marathon, Sinclair, Walmart, and all cheap discount staions, as they buy low grade gas from small refineries that do not use advanced formulations, and will cause problems down the road. I have visited all the refinery labs in the US, as a supplier of instruments for product testing, and have seen firsthand what the products consists of.
__________________
2006 GC Overland QD II
5.7 Hemi, Modern Muscle 85 mm CNC ported TB, Apexi super voltage stabilizer, Billet Tech. Catch Can, Koni FSD shocks/struts, SRT8 sway bars, Cooper AT3's, Amsoil fluids, Diablosport Intune CMR tuned by Hemifever tuning.
Reply With Quote
  #10  
Old 05-08-2010, 11:26 AM
moose158's Avatar
Member
 
Join Date: Mar 2010
Location: Gainesville, VA
Posts: 36
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1609
moose158 is on a distinguished road
Re: Newbie! Need Help with oil and gas choices

I agree with dmsfun on the royal purple. Scottina06 is right on with mobil 1. You cannot go wrong with either oil. I used RP in a high horse Trans am and loved it. I actually just yesterday put RP in my 4.7 wk for the first time, and it def runs smoother and quieter. I had been using mobil 1, but choose to go back to RP because I need all of the life I can get outta this wk, and I know the RP kept the TA together because I certianally wasn't easy on it.. Synthetic is the way to go!
__________________
Paul- 06 WK Laredo 4.7l... stock for now:D
Reply With Quote
  #11  
Old 05-08-2010, 03:55 PM
Member
 
Join Date: May 2010
Posts: 162
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1694
08pretaco is on a distinguished road
Re: Newbie! Need Help with oil and gas choices

Oils aren't the same as they were some years ago even if the PO used synthetic you can switch back to regular, the differences now adays are miniscul use whatever oils you have good experiences with. On the gas side: don't bother using an actane your engines not tuned for because your not gonna get a difference in performance, use what's specified in the owners manual or gas door. If you ever do go to a tunable chip for the engine or just over the top and a ecu retune (idk if that's possible) then get the tune for a higher octane if you want and with the tune and 91 you'll be seeing and feeling the difference
__________________
Reply With Quote
  #12  
Old 05-08-2010, 03:57 PM
1 GRAND's Avatar
Member
 
Join Date: Jul 2009
Location: Elkhorn City, Kentucky
Posts: 748
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 2603
1 GRAND has a reputation beyond repute1 GRAND has a reputation beyond repute
Re: Newbie! Need Help with oil and gas choices

My Hemi was using a quart of RP between oil changes. Every 3000 miles. I switched to Mobil 1 and have not had to add any oil between changes since the switch.

And your hesitation is like Scott said... Throttle by Wire. Gotta love it. Try to rev it up in park... It will just go to 3000rpms.
__________________

__________________


2007 Jeep Grand Cherokee Overland Hemi QD II

2006 Jeep Commander 65th Anniversary 3.7 4x4

1998 Jeep Grand Cherokee 5.9 Limited 4x4

1994 Jeep Grand Cherokee Limited V8 4x4 Lifted
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gas Milage 4.7 dpoteete Grand Cherokee - WK 10 04-16-2010 07:22 PM
Rim choices JRsmoothee Visual Modifications 31 04-11-2010 01:41 AM
So many choices xjrob Audio, Video, Navigation & Electronic Modifications 24 12-09-2009 10:36 PM
Need Some Help with Wheel Choices and what to do. Chuck Visual Modifications 76 10-09-2009 11:01 PM
Alarm Choices for WK. TimmyB Audio, Video, Navigation & Electronic Modifications 21 06-23-2009 04:53 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 09:56 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community