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What type of oil do I need for a Jaspers 4.2 L Inline 6 258 engine?

Discussion in 'CJ' started by Mylinh89, Aug 5, 2019.

  1. Aug 5, 2019 at 12:13 AM
    #1
    Mylinh89

    #1
    Mylinh89 [OP] New Member

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    CJ 7 Renegade
    Hi guys,

    I bought a CJ 7 from a nice owner with a completely rebuilt Jaspers 4.2 L Inline 6 258 engine. I would like to replace existing oil with high performance synthetic oil but don't know what type of oil I need to use / should use for the Jaspers 4.2 L Inline 6 258 engine.

    Much appreciate any info, thanks again.
     
    Mylinh89, Aug 5, 2019
    #1
  2. Aug 5, 2019 at 7:41 AM
    #2
    aggrex

    #2
    aggrex Well-Known Member

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    Welcome @Mylinh89 ...my suggestion would be to contact Jasper directly. I can't see how quality syn 5W30 would be a problem.
     
    aggrex, Aug 5, 2019
    #2
    Mylinh89[OP] and JKBob 25 like this.
  3. Aug 5, 2019 at 2:56 PM
    #3
    Mylinh89

    #3
    Mylinh89 [OP] New Member

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    1983 completely rebuilt CJ 7
    CJ 7 Renegade
    Ok. I will give them a call, thanks much for your reply.
     
    Mylinh89, Aug 5, 2019
    #3
  4. Aug 5, 2019 at 8:40 PM
    #4
    JKBob 25

    #4
    JKBob 25 Well-Known Member

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    I had a Jasper 4.0 inline dropped in my 2000 XJ. They had a break in oil in it which I was told to replace after 500 miles. Their break in period. And I could replace it with any oil I desired. Which I did with as @aggrex mentioned. 5w30 full synthetic. And put about 175k on it before I traded it in. You'll be fine with the same.
    And just to clarifie. Jasper remanufactures Mopar motors. You should use what is spec'ed for motor. Synthetic or not.

    BTW. @Mylinh89 . Well ome to the forum. :jeepwave:
     
    Last edited: Aug 5, 2019
    JKBob 25, Aug 5, 2019
    #4
    Mylinh89[OP] and aggrex like this.
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