Dealership used 5W-20 oil...
10-14-2012, 09:41 PM
#1
Junior Member
Thread Starter
Join Date: Dec 2010
Location: Doha, Qatar
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L
Dealership used 5W-20 oil...
...and now I have engine ticking/knocking and a slightly lower oil pressure at idle on my 78,000 mile 4.0. Drives pretty much the same, though.
Usual fill from the same dealer was always either 5W-30 or 10W-30, from new.
Will I be doing any damage to the Jeep if I leave this stuff in? Or will I be fine running with it until the next OCI, which will be in 6 months (probably 3,000 miles driven by then)?
Any guidance from you guys appreciated, as usual.
Cheers.
Ash
Usual fill from the same dealer was always either 5W-30 or 10W-30, from new.
Will I be doing any damage to the Jeep if I leave this stuff in? Or will I be fine running with it until the next OCI, which will be in 6 months (probably 3,000 miles driven by then)?
Any guidance from you guys appreciated, as usual.
Cheers.
Ash
10-14-2012, 09:46 PM
#2
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
Posts: 18,251
Likes: 0
Received 12 Likes
on
11 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
If you take it for VERY short drives, like it NEVER gets to operating temp, in theory, no. I doubt that will be the case in Qatar. You should really just take it back and make them fix their screwup as soon as possible.
10-14-2012, 10:06 PM
#4
CF Veteran
Join Date: Nov 2011
Location: Edmonton
Posts: 2,322
Likes: 0
Received 1 Like
on
1 Post
Year: 1990
Model: Cherokee
Engine: 4.0
you will be totally fine...but like already mentioned, the dealer should make it right. the difference in viscosity from a 20 to a 30 oil at 100C is usually only about 2 cSt...
10-14-2012, 10:59 PM
#5
Junior Member
Thread Starter
Join Date: Dec 2010
Location: Doha, Qatar
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L
Gentlemen - thank you for your input. I will be heading down to the dealership to get this sorted out later today.
Cheers again.
Ash
Cheers again.
Ash
10-15-2012, 11:37 PM
#6
Junior Member
Thread Starter
Join Date: Dec 2010
Location: Doha, Qatar
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L
An update. Things I've learned, as a total 'newb', from this issue:-
1. 5w20 is apparently factory fill for a lot of modern Chrysler vehicles. The dealership buys it in bulk and that's why the grease monkey who worked on the Jeep ended up dumping it in my 4.0 without thinking, instead of the specified 10w30.
2. The 'slippery' service manager at the dealership swore blind that the 5w20 wasn't the cause of the ticking/knocking or the lower oil pressure, said that changes in oil viscosity would not have such a dramatic effect and dismissively put it down to the age and mileage of the engine instead. Quite frankly, I smelled bull**** and more or less told him as much.
3. When I offered my opinion (based on what I'd read) that a thicker viscosity oil like a 10w30 (or maybe even a 10w40?) would probably be a good thing for the 4.0 here in Qatar, given the hot climate year round, and perhaps the greater clearances in this 'old school' 4.0 when compared to more modern engines, the 'dodgy' service manager's eyes just glazed over.
4. For the few days I ran 5w20, not only did I have ticking/knocking and lower oil pressure, I also noticed a perceptible increase in the number of times per trip that the temperature needle would creep over the 100 mark on the guage and make the e-fan kick in. Before the 5w20 was put in, this hardly happened, even in extreme heat. Only a guess, but maybe the different level/quality of lubrication offered by the 5w20 adversely impacted 'normal' operating engine temperature somehow?
5. Visually, the 5w20 when drained looked really THIN. The closest oil I've seen to water, I'd say.
6. Viscosity actually does make a massive difference. Now I have 10w30 back in it, oil pressure is back to normal (i.e. 20 at hot idle, as opposed to around 8-10 with the 5w20) and the ticking/knocking has totally gone. Temperature needle also is now sitting nicely just under the 100 mark on the guage, and not going up and down like a pair of tart's knickers.
All back to normal now. Purring like a kitten. Thanks again to all who contributed.
Ash
1. 5w20 is apparently factory fill for a lot of modern Chrysler vehicles. The dealership buys it in bulk and that's why the grease monkey who worked on the Jeep ended up dumping it in my 4.0 without thinking, instead of the specified 10w30.
2. The 'slippery' service manager at the dealership swore blind that the 5w20 wasn't the cause of the ticking/knocking or the lower oil pressure, said that changes in oil viscosity would not have such a dramatic effect and dismissively put it down to the age and mileage of the engine instead. Quite frankly, I smelled bull**** and more or less told him as much.
3. When I offered my opinion (based on what I'd read) that a thicker viscosity oil like a 10w30 (or maybe even a 10w40?) would probably be a good thing for the 4.0 here in Qatar, given the hot climate year round, and perhaps the greater clearances in this 'old school' 4.0 when compared to more modern engines, the 'dodgy' service manager's eyes just glazed over.
4. For the few days I ran 5w20, not only did I have ticking/knocking and lower oil pressure, I also noticed a perceptible increase in the number of times per trip that the temperature needle would creep over the 100 mark on the guage and make the e-fan kick in. Before the 5w20 was put in, this hardly happened, even in extreme heat. Only a guess, but maybe the different level/quality of lubrication offered by the 5w20 adversely impacted 'normal' operating engine temperature somehow?
5. Visually, the 5w20 when drained looked really THIN. The closest oil I've seen to water, I'd say.
6. Viscosity actually does make a massive difference. Now I have 10w30 back in it, oil pressure is back to normal (i.e. 20 at hot idle, as opposed to around 8-10 with the 5w20) and the ticking/knocking has totally gone. Temperature needle also is now sitting nicely just under the 100 mark on the guage, and not going up and down like a pair of tart's knickers.
All back to normal now. Purring like a kitten. Thanks again to all who contributed.
Ash
10-16-2012, 01:05 AM
#7
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
Posts: 18,251
Likes: 0
Received 12 Likes
on
11 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yikes! A simple viscosity change shouldn't be THAT bad. Like hankthetank said the difference isn't THAT large. I'm wondering if there's a bigger difference between the two oils your dealership is using, or they messed up on the oil filter, too.
Trending Topics
10-16-2012, 06:19 AM
#8
CF Veteran
Join Date: Jul 2012
Location: SD
Posts: 1,395
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Cherokee
Engine: 4.0
Agreed. I can see the increase in ticking, and the lower pressure, but it should not have caused the temp swings.
10-16-2012, 08:08 AM
#9
Senior Member
Join Date: Jan 2012
Posts: 952
Likes: 0
Received 3 Likes
on
3 Posts
Year: 2004
Model: Grand Cherokee
Engine: 2000 4.0
A+++ at 100C there is very little difference in viscosity whether it is 20wt or even 40wt. Viscosity spread is seen at low temperatures. The higher engine temps make no sense because lower viscosity = more flow = more heat removal. Are you absolutely sure of WHAT they put in your engine??
10-16-2012, 08:50 AM
#10
Senior Member
Join Date: May 2011
Posts: 749
Likes: 0
Received 1 Like
on
1 Post
Year: 1997
Model: Cherokee
Engine: 4.0
yes the viscosity in oil makes a difference in engine temp.
oil has 4 jobs
clean
lubricate
cool
cant remember the last.
the reason big trucks run 15w-40 and high capacity is for oil cooling.
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....
oil has 4 jobs
clean
lubricate
cool
cant remember the last.
the reason big trucks run 15w-40 and high capacity is for oil cooling.
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....
10-16-2012, 09:15 AM
#12
CF Veteran
Join Date: Mar 2009
Location: Tenn. and Mich.
Posts: 28,068
Likes: 0
Received 6 Likes
on
6 Posts
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
yes the viscosity in oil makes a difference in engine temp.
oil has 4 jobs
clean
lubricate
cool
cant remember the last.
the reason big trucks run 15w-40 and high capacity is for oil cooling.
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....
oil has 4 jobs
clean
lubricate
cool
cant remember the last.
the reason big trucks run 15w-40 and high capacity is for oil cooling.
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....
1. Lubricate
2. Protect
3. Clean
4. Cool
Hey Ash, I'm glad to hear you straightened out the dealer and got the correct oil in your low mileage XJ before any damage was done.
10-16-2012, 09:26 AM
#14
CF Veteran
Join Date: Sep 2010
Location: Milwaukee, WI
Posts: 21,168
Likes: 0
Received 5 Likes
on
5 Posts
Year: 1987
Engine: Check
An update. Things I've learned, as a total 'newb', from this issue:-
1. 5w20 is apparently factory fill for a lot of modern Chrysler vehicles. The dealership buys it in bulk and that's why the grease monkey who worked on the Jeep ended up dumping it in my 4.0 without thinking, instead of the specified 10w30.
2. The 'slippery' service manager at the dealership swore blind that the 5w20 wasn't the cause of the ticking/knocking or the lower oil pressure, said that changes in oil viscosity would not have such a dramatic effect and dismissively put it down to the age and mileage of the engine instead. Quite frankly, I smelled bull**** and more or less told him as much.
3. When I offered my opinion (based on what I'd read) that a thicker viscosity oil like a 10w30 (or maybe even a 10w40?) would probably be a good thing for the 4.0 here in Qatar, given the hot climate year round, and perhaps the greater clearances in this 'old school' 4.0 when compared to more modern engines, the 'dodgy' service manager's eyes just glazed over.
4. For the few days I ran 5w20, not only did I have ticking/knocking and lower oil pressure, I also noticed a perceptible increase in the number of times per trip that the temperature needle would creep over the 100 mark on the guage and make the e-fan kick in. Before the 5w20 was put in, this hardly happened, even in extreme heat. Only a guess, but maybe the different level/quality of lubrication offered by the 5w20 adversely impacted 'normal' operating engine temperature somehow?
5. Visually, the 5w20 when drained looked really THIN. The closest oil I've seen to water, I'd say.
6. Viscosity actually does make a massive difference. Now I have 10w30 back in it, oil pressure is back to normal (i.e. 20 at hot idle, as opposed to around 8-10 with the 5w20) and the ticking/knocking has totally gone. Temperature needle also is now sitting nicely just under the 100 mark on the guage, and not going up and down like a pair of tart's knickers.
All back to normal now. Purring like a kitten. Thanks again to all who contributed.
Ash
1. 5w20 is apparently factory fill for a lot of modern Chrysler vehicles. The dealership buys it in bulk and that's why the grease monkey who worked on the Jeep ended up dumping it in my 4.0 without thinking, instead of the specified 10w30.
2. The 'slippery' service manager at the dealership swore blind that the 5w20 wasn't the cause of the ticking/knocking or the lower oil pressure, said that changes in oil viscosity would not have such a dramatic effect and dismissively put it down to the age and mileage of the engine instead. Quite frankly, I smelled bull**** and more or less told him as much.
3. When I offered my opinion (based on what I'd read) that a thicker viscosity oil like a 10w30 (or maybe even a 10w40?) would probably be a good thing for the 4.0 here in Qatar, given the hot climate year round, and perhaps the greater clearances in this 'old school' 4.0 when compared to more modern engines, the 'dodgy' service manager's eyes just glazed over.
4. For the few days I ran 5w20, not only did I have ticking/knocking and lower oil pressure, I also noticed a perceptible increase in the number of times per trip that the temperature needle would creep over the 100 mark on the guage and make the e-fan kick in. Before the 5w20 was put in, this hardly happened, even in extreme heat. Only a guess, but maybe the different level/quality of lubrication offered by the 5w20 adversely impacted 'normal' operating engine temperature somehow?
5. Visually, the 5w20 when drained looked really THIN. The closest oil I've seen to water, I'd say.
6. Viscosity actually does make a massive difference. Now I have 10w30 back in it, oil pressure is back to normal (i.e. 20 at hot idle, as opposed to around 8-10 with the 5w20) and the ticking/knocking has totally gone. Temperature needle also is now sitting nicely just under the 100 mark on the guage, and not going up and down like a pair of tart's knickers.
All back to normal now. Purring like a kitten. Thanks again to all who contributed.
Ash
10-16-2012, 09:42 AM
#15
Senior Member
Join Date: Jan 2012
Posts: 952
Likes: 0
Received 3 Likes
on
3 Posts
Year: 2004
Model: Grand Cherokee
Engine: 2000 4.0
[QUOTE=jebmccall;
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....[/QUOTE]
Not necessarily, less pressure can mean greater flow which is the requirement for heat removal. I have seen engines junked up with lucas, STP or other viscosity improvers....oil pressure goes up,flow goes down,heat goes up,tick gets louder.
also think about it, lack of pressure means lack of lubrication which means increased friction causing more heat....[/QUOTE]
Not necessarily, less pressure can mean greater flow which is the requirement for heat removal. I have seen engines junked up with lucas, STP or other viscosity improvers....oil pressure goes up,flow goes down,heat goes up,tick gets louder.