NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #1  
Old December 5th, 2021, 13:23
Ken M Ken M is offline
NAXJA Forum User
 
Join Date: Jun 2007
Location: Anchorage
Posts: 18
High Zinc Motor Oil & Flat Tappets

For years I've been using high zinc oil or a zinc additive in my old-technology British cars because the experts say the old flat tappet engines need the zinc to protect the cam & lifters. It occurs to me the 4 liter Jeep is pretty much old tech. Should I be using high zinc oil in my 4 liter XJ?
Reply With Quote
  #2  
Old December 5th, 2021, 14:39
maxbraketorque maxbraketorque is offline
NAXJA Forum User
 
Join Date: Jul 2020
Location: PDX
Posts: 651
Re: High Zinc Motor Oil & Flat Tappets

https://540ratblog.wordpress.com/

Its a very long article. It was updated in 2021. It has ratings for a huge number of motor oils. Compare high ZDDP oils to those at the top of the list.
Reply With Quote
  #3  
Old December 5th, 2021, 17:47
Unclewolverine Unclewolverine is offline
NAXJA Forum User
 
Join Date: Jun 2019
Location: Kansas
Posts: 578
Re: High Zinc Motor Oil & Flat Tappets

A lot of people like to run high zinc in these. The 4.0 is based off a 1960s amc engine, in practice I don't think it really cares, as long as it has oil and a little pressure they tend to keep going. I run rotella, because it's cheap and I run so many miles I have to change oil about once a month.
Reply With Quote
  #4  
Old December 5th, 2021, 22:27
freggie freggie is offline
NAXJA Forum User
 
Join Date: Feb 2018
Location: CA
Posts: 33
Re: High Zinc Motor Oil & Flat Tappets

I'm running Rotella T6, it has less zinc with the newer formulation but I think its still higher then others. It's diesel oil that's why it has a higher zinc content. Walmart is usually the best place ~$22 a jug.
Reply With Quote
  #5  
Old December 6th, 2021, 05:10
nate_o23 nate_o23 is offline
NAXJA Forum User
 
Join Date: Oct 2021
Location: Ohio
Posts: 10
Re: High Zinc Motor Oil & Flat Tappets

If you have a Rural King near you, their store brand diesel oil has high zinc content at reasonable price. I run it in all my old engines.
Reply With Quote
  #6  
Old December 6th, 2021, 06:06
75SV1 75SV1 is offline
NAXJA Member
 
Join Date: Sep 2004
Location: Hope,IN
Posts: 983
Re: High Zinc Motor Oil & Flat Tappets

As others have said, I too run Rotella T6. I bought some at NAPA on sale for $23 or so this weekend. I do have to ask what you consider High ZDDP? I think the T6 and other diesel oils have about 1000 ppm of Zinc. Some of the Hot Roaders or Older Muscle car owners use Brad Penns with 1600 ppm Zinc.
I have also used Rotella T4, both 15W-45 and 10W-30. I see the list posted, but at #12 to #16 T6 will do its job. Also, different engines do different things to different oils.
I also trust and try to use synthetic oils. Still, the new conventional oils are no slouch either. Also, the cats on the 4.0l are older type. So, the Zinc won't plug them like newer cats. Now if I had a 2000 Cali or 2001, with the pre-cats, then I might have to think about it. I actually do have a 2001, but its a shell and I'll have to see who I configure it.
So, Rotella, Delvac and other Deisel Oils should fill the bill. AMsoil would be a good choice along with Shaffer, if you want to spend a bit more.
Reply With Quote
  #7  
Old December 13th, 2021, 14:58
Ken M Ken M is offline
NAXJA Forum User
 
Join Date: Jun 2007
Location: Anchorage
Posts: 18
Re: High Zinc Motor Oil & Flat Tappets

I've been using Valvoline VR1 Racing Oil in my old British cars. Valvoline doesn't address the issue of potential damage to catalytic converters, but says VR1 is good for passenger cars as well as high performance cars. I have assumed that anything sold for highway use must be compatible with cats. Has anyone read anything different?
Reply With Quote
  #8  
Old December 14th, 2021, 06:09
75SV1 75SV1 is offline
NAXJA Member
 
Join Date: Sep 2004
Location: Hope,IN
Posts: 983
Re: High Zinc Motor Oil & Flat Tappets

There are differences in the technologies between different eras of smog control. I think the dividing year is about 2004 for cats. It might also depend on vehicle.
Reply With Quote
  #9  
Old December 14th, 2021, 16:00
Ken M Ken M is offline
NAXJA Forum User
 
Join Date: Jun 2007
Location: Anchorage
Posts: 18
Re: High Zinc Motor Oil & Flat Tappets

I just found the relevant info on the Valvoline web site after failing to find it earlier. It seems a bit contradictory, saying it can be used in "modern muscle cars" but "not recommended for use in vehicles with cats." VALVOLINE'S statement: "VR1 Racing Engine Oil is recommended for engines burning gasoline and full or partial alcohol fuels in track and street service. For use in classic and modern muscle cars, race cars and high-performance passenger cars.
Valvoline VR1 Racing Engine Oil is not recommended for use in vehicles with catalytic converters"
Reply With Quote
  #10  
Old December 18th, 2021, 14:06
bwinter1946 bwinter1946 is offline
NAXJA Forum User
 
Join Date: Jun 2007
Location: Madera, California
Posts: 334
Re: High Zinc Motor Oil & Flat Tappets

Lucas makes a variety of high zinc oils for gas and diesel engines.


https://lucasoil.com/pdf/Zinc_Values_MotorcycleOil.pdf
Reply With Quote
  #11  
Old December 21st, 2021, 19:18
devildog0's Avatar
devildog0 devildog0 is offline
NAXJA Member
 
Join Date: Apr 2005
Location: Hunt County Texas
Posts: 940
Re: High Zinc Motor Oil & Flat Tappets

Quote:
Originally Posted by Ken M View Post
I just found the relevant info on the Valvoline web site after failing to find it earlier. It seems a bit contradictory, saying it can be used in "modern muscle cars" but "not recommended for use in vehicles with cats." VALVOLINE'S statement: "VR1 Racing Engine Oil is recommended for engines burning gasoline and full or partial alcohol fuels in track and street service. For use in classic and modern muscle cars, race cars and high-performance passenger cars.
Valvoline VR1 Racing Engine Oil is not recommended for use in vehicles with catalytic converters"
ZDDP is a catalytic converter poison. If you have a vehicle that burns oil it can cause your cat to die an early death. This is one reason zddp levels have steadily been taken out of modern oils. VR1 is a "race oil" and Valvoline doesn't recommend it for street use for that reason. I don't even think it actually carries an API cert.
__________________
1995 XJ Country/4.0L/AW4/231/UpCountry Suspension
2004 Suzuki DL650 VStrom/1978 Suzuki GS1000E/2003 Yamaha TW200
1982 Suzuki GS850G (barnfind project)
Reply With Quote
  #12  
Old December 29th, 2021, 20:35
Evan03 Evan03 is offline
NAXJA Forum User
 
Join Date: Jun 2017
Location: Idaho
Posts: 1,392
High Zinc Motor Oil & Flat Tappets

Rotella is one of the best oils to run along with chevron. It doesnt have a fancy package or Marketing but is one of the best

I run chevron 15/40 in everything.

Look up sugestions of oils to run for camshaft break in. The list is usually short.

Oils like rotella and chevron make the list.

Sent from my SM-G781U using Tapatalk
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
(3) Bottles ZDDPlus Zinc Oil Additive, for flat-tappet engines such as the 4.0 XpedientJ NAC Classifieds 0 February 9th, 2011 14:59
Zinc additives anybody? PurpleCherokee OEM Tech Discussion 54 September 30th, 2008 11:13
How high RPM on stock motor? Goatman Jeep Street and Performance 29 July 15th, 2008 09:45
new motor, high oil psi jeepnuts311 OEM Tech Discussion 5 April 1st, 2007 08:33
High Idle after new motor install XJJeepinMatt Modified Tech Discussion 2 August 8th, 2004 21:42


All times are GMT -7. The time now is 05:07.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014