Summer oil: 10W-40? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Summer oil: 10W-40?

Stainless Steel Door Hinge PinsPoly Door Hinge BushingsDisc Brake Kits from ECGS

Reply
Unread 04-27-2009, 02:44 PM   #1
Dannyboy18
Registered User
 
Join Date: Jan 2005
Posts: 2,097
Summer oil: 10W-40?

I am about 1000 miles out from my next oil change and after reading a couple recent posts I am wondering: is it a good idea to run 10W-40 oil in the summer rather than 10W-30?

Since buying my Jeep in Spring 2005 I have ran standard 10W-30 (no max life blend). Should I switch to 10W-40 to help with the larger clearances caused by higher miles?

I have 151,000 miles right now.

-Dan P.

__________________
1999 Cherokee Sport - Black; 4.0L AW4, NP231 w/ D30 and 8.25C.
RE 3.5" Super Ride w/ full packs (4* shims) + OME shocks + RE SYE w/ Tom Woods CV
Yukon 4.10s
AR Baja Alloy Wheels - 15x8 + Bridgestone Dueler Revo A/Ts - 31x10.50x15
TeraFlex Adj. Trackbar + TeraFlex Quick Disconnects & WARN T-case skid
Dannyboy18 is offline   Reply With Quote
Unread 04-27-2009, 02:48 PM   #2
XJLI
Registered User
1993 XJ Cherokee 
 
Join Date: Sep 2006
Location: Long Island, NY
Posts: 3,575
I run 15w-40 diesel oil. the thicker the better in my POS motor.
__________________
Factory Four Link


XJLI is offline   Reply With Quote
Unread 04-27-2009, 02:58 PM   #3
slvrathlon
Registered User
1999 XJ Cherokee 
 
Join Date: Aug 2006
Location: Raleigh, NC
Posts: 209
I have run 10w 30, max life stuff... seemed to be ok. But would be interested in hearing others thoughts as well.
slvrathlon is offline   Reply With Quote
Unread 04-27-2009, 03:07 PM   #4
440_Magnum
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2008
Location: Austin Texas
Posts: 833
Quote:
Originally Posted by Dannyboy18 View Post
I am about 1000 miles out from my next oil change and after reading a couple recent posts I am wondering: is it a good idea to run 10W-40 oil in the summer rather than 10W-30?

Since buying my Jeep in Spring 2005 I have ran standard 10W-30 (no max life blend). Should I switch to 10W-40 to help with the larger clearances caused by higher miles?

I have 151,000 miles right now.

-Dan P.

If you've got good oil pressure and aren't burning oil, there's not any real reason to go to heavier oil. It certainly won't hurt- I run Rotella T Synthetic 5w40 year-round, but I do that mainly because I wanted an HD oil and Rotella T is hard to get in Xw30 weight (you can, but you have to order it- 5w40 is on the shelves everywhere). If I could have the best of everything, I'd run a synthetic HD oil in 0w30 grade.

I did have an oil analysis done at just under 5000 miles on my current fill of Rotella, and the lab said it should be just fine until at least 6000 miles so its obviously doing a good job of protecting my 4.0. All the wear metals were below average for the 4.0:



Whether or not to run a "high mileage" oil is up to you. They really don't help with larger clearances, but most of them have very good additive packages and are much like using a heavy-duty oil. Valvoline MaxLife Synthetic Blend is supposedly very good. Again, unless you're leaking, burning oil, or have low pressure I don't see the need for a high mileage oil.
440_Magnum is offline   Reply With Quote
Unread 04-27-2009, 03:13 PM   #5
Dannyboy18
Registered User
 
Join Date: Jan 2005
Posts: 2,097
My only leak right now is the valve cover. It drips pretty consistently, but I think I will get that fixed this summer when I'm working and have a good amount of cash. All my other leaks have since been fixed.

-Dan P.
__________________
1999 Cherokee Sport - Black; 4.0L AW4, NP231 w/ D30 and 8.25C.
RE 3.5" Super Ride w/ full packs (4* shims) + OME shocks + RE SYE w/ Tom Woods CV
Yukon 4.10s
AR Baja Alloy Wheels - 15x8 + Bridgestone Dueler Revo A/Ts - 31x10.50x15
TeraFlex Adj. Trackbar + TeraFlex Quick Disconnects & WARN T-case skid
Dannyboy18 is offline   Reply With Quote
Unread 04-27-2009, 03:19 PM   #6
Cherokee2000
Registered User
2000 XJ Cherokee 
 
Join Date: Jan 2008
Location: Montreal
Posts: 244
I just put in Amsoil 10w-40 synthetic and Im less then impressed. I was running Total Quartz 9000 5w-40 and it made the engine run quieter then the amsoil does. Either way, I like running a 40 weight, I find it runs smoother and makes up for tolerances.
Cherokee2000 is offline   Reply With Quote
Unread 04-27-2009, 04:13 PM   #7
xjarchaeologist
Registered User
2001 XJ Cherokee 
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 405
I was wondering the same thing. I have low oil pressure, so I was thinking about switching to 10W-40...I'm interested to hear this one...
__________________
2001 Cherokee
31x10.50 Dunlop Mud Rovers, OME HD Leafs, RE Coil Spacers
xjarchaeologist is offline   Reply With Quote
Unread 04-27-2009, 04:27 PM   #8
swells
Registered User
1990 XJ Cherokee 
 
Join Date: Dec 2008
Location: utah
Posts: 127
I run 30w and lucas It runs quieter I have 181.000 miles dosent burn oil yet.
__________________
thanks swells
swells is offline   Reply With Quote
Unread 04-27-2009, 05:25 PM   #9
94HOCHEROKEE
Registered User
1994 XJ Cherokee 
 
Join Date: Nov 2007
Location: Colorado
Posts: 369
Recently I went to a Penzoil training class for my job and good ol' Wal-mart tire lube express, and they were saying how 5w-30 is better protection for cold/dry starts, and runs through your engine faster making it run cooler...? It also creates less sludge in your engine. It was news to me cause I thought the heavier weight 10w30 would be better protection all around. Thinking of running 5w30 instead of 10w30...... I use the Val. Max Life Full Syn and I have no complaints.
94HOCHEROKEE is offline   Reply With Quote
Unread 04-28-2009, 02:18 PM   #10
440_Magnum
Registered User
1999 XJ Cherokee 
 
Join Date: Jun 2008
Location: Austin Texas
Posts: 833
Quote:
Originally Posted by 94HOCHEROKEE View Post
Recently I went to a Penzoil training class for my job and good ol' Wal-mart tire lube express, and they were saying how 5w-30 is better protection for cold/dry starts, and runs through your engine faster making it run cooler...? It also creates less sludge in your engine. It was news to me cause I thought the heavier weight 10w30 would be better protection all around. Thinking of running 5w30 instead of 10w30...... I use the Val. Max Life Full Syn and I have no complaints.
Its true. You really should probably run the thinnest grade that still gives good oil pressure. Like I said, I really would like it if Rotella had a 0w30 grade, but they don't. Jeeps do "like" their oil a little heavier than other engines, so a 5w40 is about right for them. But you'd never catch me running something like a 15w50 or 20w50.
440_Magnum is offline   Reply With Quote
Unread 04-29-2009, 02:40 PM   #11
colt933
Registered User
2001 XJ Cherokee 
 
Join Date: Apr 2008
Location: Nashville
Posts: 151
The owner's manual states 5w30 in really cold climates and 10w30 as universal. Both are the same after it warms up.
__________________
2001 Jeep Cherokee Sport
Old Man Emu 3" lift coils and leafs w/AAL
Old Man Emu Nitro Chargers front and back
Discos
AA SYE with front drive shaft
Stock Aluminum 5-spoke 15" wheels
colt933 is offline   Reply With Quote
Unread 04-29-2009, 03:35 PM   #12
XJLI
Registered User
1993 XJ Cherokee 
 
Join Date: Sep 2006
Location: Long Island, NY
Posts: 3,575
Quote:
Originally Posted by 440_Magnum View Post
Its true. You really should probably run the thinnest grade that still gives good oil pressure. Like I said, I really would like it if Rotella had a 0w30 grade, but they don't. Jeeps do "like" their oil a little heavier than other engines, so a 5w40 is about right for them. But you'd never catch me running something like a 15w50 or 20w50.
My jeep drank all 6qts 5w30 this winter in 2 months. these motors are almost 50 year old technology.
__________________
Factory Four Link


XJLI is offline   Reply With Quote
Unread 04-29-2009, 05:55 PM   #13
paroxysym
Registered User
2007 WK 
 
Join Date: Jan 2005
Location: Baltimore, Md.
Posts: 3,698
Xjli what brand oil are you running again in a 5w-40? I'm at 112' and she burned about a qt of 5w-30 between oil changes. Would like to go with something I know she won't burn that much but still provide protection and proper lubrication.. That's why I'm curious about the 5w-40 in summer?
__________________
2007.5 WK Laredo 4.7
OEM+
paroxysym is offline   Reply With Quote
Unread 04-29-2009, 06:16 PM   #14
XJLI
Registered User
1993 XJ Cherokee 
 
Join Date: Sep 2006
Location: Long Island, NY
Posts: 3,575
Quote:
Originally Posted by paroxysym View Post
Xjli what brand oil are you running again in a 5w-40? I'm at 112' and she burned about a qt of 5w-30 between oil changes. Would like to go with something I know she won't burn that much but still provide protection and proper lubrication.. That's why I'm curious about the 5w-40 in summer?
castrol diesel 15w-40
__________________
Factory Four Link


XJLI is offline   Reply With Quote
Unread 04-29-2009, 06:47 PM   #15
sskinner
Registered User
1998 XJ Cherokee 
 
Join Date: Apr 2009
Location: Ohio
Posts: 167
hey I have noticed my oil pressure drops down to 15 to 20 psi once it warms up at idle and will hold a soalid 40 psi under load is this normal?
sskinner is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.