switching to synthetic
05-11-2014, 09:52 AM
#19
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 15 Likes
on
15 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
The facts are 0W30, 5W30, 10W30 and straight 30 r all the same vis when they reach 100C/212F operating temp. In a perfect world, oil temp would always remain at operating temp, even when the motor has been off overnight, thus providing optimum flow which equals optimum lubrication. In an imperfect world, when the motor has been off overnight and oil temp is below operating temp (notice I did not say "oil is cold"), oil flow is drastically reduced because the oil has thickened thus restricting flow.
Again, flow equals lubrication. 10W30 will not flow as quickly as 0W30 or 5W30 when the oil temp is below operating temp (100C/212F).
Last edited by djb383; 05-11-2014 at 09:54 AM.
05-11-2014, 10:07 AM
#20
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
Posts: 18,251
Likes: 0
Received 13 Likes
on
12 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Do you guys think hydrogenated rapeseed counts as a synthetic oil? Conventional rapeseed was used to lubricate steam engines.
Last edited by salad; 05-11-2014 at 10:10 AM.
05-11-2014, 10:29 AM
#22
CF Veteran
Join Date: Sep 2010
Location: Mercer County, NJ
Posts: 12,692
Likes: 0
Received 4 Likes
on
4 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Have done tons of research and am deciding to go synthetic. It's a 2000 Cherokee with 127k , previous owner said he replaced the oil pan and valve cover gasket. Still has a small leak I'm guessing from the rear main. I have read all over forums that Mobil 1 10-30 full synthetic is the way to go. I don't think it will be a huge deal unless I discover even more leaks in which case I would switch back to dyno oil. What do you guys think? Any suggestions? If you are running synthetic, what brand and when did you switch, any leaks or problems from switching?
05-11-2014, 10:53 AM
#24
Junior Member
Thread Starter
Join Date: Apr 2014
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0
Alright, well it seems like I should just stick to dyno oil. I have read about using rottela in other forums and it's popping up alot here too. What would Mobil 1 dyno oil be is it their super? Or should I just do rottela 10w30?
05-11-2014, 10:54 AM
#25
Senior Member
Join Date: Mar 2014
Location: Central Indiana
Posts: 552
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0
05-11-2014, 10:55 AM
#27
CF Veteran
Join Date: Sep 2010
Location: Mercer County, NJ
Posts: 12,692
Likes: 0
Received 4 Likes
on
4 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
If u r switching to synthetic, why not 0W30 or at least 5W30?
Has your research been mostly from reading opinions or reading facts?http://www.supramania.com/aehaas/
05-11-2014, 12:16 PM
#28
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 15 Likes
on
15 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
If u r considering conventional oil, 5W30 would be better than 10W30. No such animal as Mobil 1 dyno oil....all Mobil 1 is synthetic. Rotella T6 0W40 would be a better choice than 5W40.....if u can find it.
Last edited by djb383; 05-11-2014 at 12:28 PM.
05-11-2014, 12:22 PM
#29
Junior Member
Thread Starter
Join Date: Apr 2014
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0
Thanks for the input guys it was really helpful. I did begin to read the link and understand how oil works a bit better. I'll try out the Mobil1 full synthetic stuff and see how it goes. I'm also using a mopar filter with it. Hope it goes well as I've heard a lot of great things about this oil.
05-11-2014, 03:42 PM
#30
CF Veteran
Join Date: Jul 2013
Location: Monett, MO.
Posts: 7,554
Likes: 0
Received 15 Likes
on
15 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
I've ran Mobile 1 for many years in my race cars starting in the late 70's. If I were going to use it in my XJ (which I would "Never" do) it would be a 20-50 wt. Then I could go to the car wash and clean the engine and the next few days watch where the new oil leaks are coming from. My 4.0 has over 240k on it also.
I run Syn. oil in everything I own except for a diesel Motor Home a F-350 CC pickup and my XJ all get Rotella T, I buy it buy the gallon anyway.
I run Syn. oil in everything I own except for a diesel Motor Home a F-350 CC pickup and my XJ all get Rotella T, I buy it buy the gallon anyway.