1. Welcome to Jeeps.net!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Jeep discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Jeep owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

What's the best oil for my engine?

Discussion in 'Cherokee' started by ShakyShane, Aug 29, 2019.

  1. Aug 29, 2019 at 5:50 PM
    #1
    ShakyShane

    #1
    ShakyShane [OP] New Member

    Joined:
    Aug 29, 2019
    Member:
    #3756
    Messages:
    4
    Gender:
    Male
    First Name:
    Michael
    Vehicle:
    1999 Jeep Grand Cherokee Lerado 4.0L
    Bigger tires p255 r16
    Ok so I bought my grandpa's jeep he retired years ago and let it sit for awhile. It is a 1999 jeep grand Cherokee lorado 4.0 4x4. 136,000 miles on it when I got it. It's at 138,680 miles now. I took my grandpa's advice and decided to put Castrol GTX 10w30 which is what he always used. No oil leaks or burning of oil. I check the stick once a week. Stays on full. I replaced the idler pully tensioner pully and this weekend I'm putting a new thermostat and water pump on it. Anyway I'm asking about the oil. I feel like if what's working works then that's great. But synthetic has me thinking. I use mobile one filters.

    20190820_185403.jpg
     
    ShakyShane, Aug 29, 2019
    #1
    spyder62 likes this.
  2. Aug 29, 2019 at 6:12 PM
    #2
    JKBob 25

    #2
    JKBob 25 Well-Known Member

    Joined:
    Mar 22, 2017
    Member:
    #1197
    Messages:
    3,874
    Gender:
    Male
    First Name:
    Bob
    Jersey Shore, NJ
    Vehicle:
    2016 JK Wrangler Sport
    Welcome to the forum @ShakyShane .
    Synthetic oils wont hurt your motor. If you decide to go with one. Use the same weight the manufacture recommends. But the Castrol 10 w 30 is fine for your GC. Have fun with the forum. Buncha great people here. :jeepwave:
     
    JKBob 25, Aug 29, 2019
    #2
    aggrex and ShakyShane[OP] like this.
  3. Aug 29, 2019 at 6:17 PM
    #3
    Awrench

    #3
    Awrench Well-Known Member

    Joined:
    May 12, 2018
    Member:
    #2303
    Messages:
    975
    Gender:
    Male
    Vehicle:
    3 jeeps
    watch out for the hype..
     
    Last edited: Sep 1, 2019
    Awrench, Aug 29, 2019
    #3
    aggrex and JKBob 25 like this.
  4. Aug 29, 2019 at 6:41 PM
    #4
    aggrex

    #4
    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
    #203
    Messages:
    4,840
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome @ShakyShane ....Looks like your grandpa had a well maintained JGC. You're taking the right steps in vehicle maintenance. I'm using Pennzoil synthetic oil / PurolatorOne filters in my vehicles. Walmart everyday low prices keeps costs reasonable. Oil+filter change intervals @5000-6000 miles and air filter @12-15K. Regular Dino Castrol GTX is a fine choice. Just follow recommended oil viscosity and you probably don't need to check it weekly if it seems to be consistent between oil changes.
     
    aggrex, Aug 29, 2019
    #4
    JKBob 25 and ShakyShane[OP] like this.
  5. Sep 5, 2019 at 11:47 AM
    #5
    Prerunner1982

    #5
    Prerunner1982 Well-Known Member

    Joined:
    Aug 4, 2017
    Member:
    #1745
    Messages:
    1,356
    Gender:
    Male
    First Name:
    Jon
    Vehicle:
    93 XJ 2 door
    Many Jeepers with 4.0s recommend RotellaT as it is supposed to have higher concentrations of Zinc which are good for a flat tappet engine like the 4.0.
    I currently run Valvoline 10w30 or Valvoline High mileage synthetic blend on my recently freshened up 4.0, she runs quiet.
     
    Prerunner1982, Sep 5, 2019
    #5
    JKBob 25 likes this.
  6. Oct 28, 2019 at 6:00 AM
    #6
    Jeeptrick

    #6
    Jeeptrick Member

    Joined:
    Oct 28, 2019
    Member:
    #4005
    Messages:
    9
    Gender:
    Male
    First Name:
    David
    Vehicle:
    2004 TJ
    What is the best motor oil to use on an 04 TJ with 160k miles?
     
    Last edited: Oct 28, 2019
    Jeeptrick, Oct 28, 2019
    #6
  7. Oct 28, 2019 at 1:26 PM
    #7
    Jim Beam

    #7
    Jim Beam Well-Known Member

    Joined:
    Feb 11, 2019
    Member:
    #2891
    Messages:
    596
    Gender:
    Male
    First Name:
    Donald
    Vehicle:
    1986 CJ7
    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    I am a big Rotella fan and use it for all my cars. Although I think they have backed off with the zinc over the years, you could look that up. Valvo is also a great oil.
     
    Jim Beam, Oct 28, 2019
    #7
Register FREE to Reply!
To Top