Oil type/brand
Seasoned Member
Joined: Jan 2012
Posts: 401
Likes: 1
From: Smithfield, VA
Year: 1997
Model: Cherokee
Engine: 4.0
Hey dude I don't care if you didn't search. I was making the comments because this is one on those never answered questions. Asking what oil to buy is like asking for the winning lottery numbers. Everyone gonna give you a different answer and their reason for using it.
These oil threads are often comical actually.
Ask away man, Thats what the forum is here for. And good luck on finding the best oil.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Hey dude I don't care if you didn't search. I was making the comments because this is one on those never answered questions. Asking what oil to buy is like asking for the winning lottery numbers. Everyone gonna give you a different answer and their reason for using it.
These oil threads are often comical actually.
Ask away man, Thats what the forum is here for. And good luck on finding the best oil.
These oil threads are often comical actually.
Ask away man, Thats what the forum is here for. And good luck on finding the best oil.
Senior Member
Joined: Aug 2011
Posts: 994
Likes: 0
From: Bowie, MD
Year: 2000
Model: Cherokee
Engine: 4.0L I6
Member
Joined: Oct 2011
Posts: 163
Likes: 0
Model: Cherokee
I use Diesel oil in mine. When I say Diesel oil I mean oil formulated for high mileage, high heat high everything tractor trailer engines. These oils still use detergents that others don't as well. Can't hurt to keep the inside clean.
The 15/40 will move a little slow on start up when it gets cold. I don't use it in the winter because I HATE seeing my oil light come on because pressure builds so slow.
Rotella is widely used in motorcycles as well. Like my own Harley. It's just a good dang oil.
Stay way from Fram filters, they are the devil.
The 15/40 will move a little slow on start up when it gets cold. I don't use it in the winter because I HATE seeing my oil light come on because pressure builds so slow.
Rotella is widely used in motorcycles as well. Like my own Harley. It's just a good dang oil.
Stay way from Fram filters, they are the devil.
Member
Joined: Feb 2012
Posts: 122
Likes: 0
From: Monticello, In
Year: 1997
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Apr 2008
Posts: 7,661
Likes: 15
From: Smiths Station, Al
Year: 87
Model: Wagoneer
Engine: 4.0 I6
I have always heard about some flat tappet engine stuff. Anyway. 15/40 has been reccomended by people who have Jeepd the 4.0 for longer than I have so I just shut-up and listen.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Diesel has higher detergents, is made for turbocharged engines etc etc. I've been using it since about 2001. People go nuts over the weights etc. We used 15/40 in the 4.0s when new at the dealership.
These aren't BMWs, Porsches, Mercedes, Lexus or Infiniti vehicles with HLAs, overhead cams, roller lifters. They're good old basic engines.
These aren't BMWs, Porsches, Mercedes, Lexus or Infiniti vehicles with HLAs, overhead cams, roller lifters. They're good old basic engines.
Thread Starter
Member
Joined: Jul 2011
Posts: 131
Likes: 1
From: NC
Year: 1995
Model: Cherokee
Engine: 4.0 HO
I have another question. If heard about running some ATF fluid in there right before the oil change to clean out the crankcase. Is that safe to do with 217k on the engine?
