4.0 -98 ZJ clanking engine sound when cool - JeepForum.com
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Unread 08-02-2009, 01:17 PM   #1
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Join Date: Oct 2008
Location: Sweden
Posts: 23
4.0 -98 ZJ clanking engine sound when cool

I have an 4.0 ZJ with a not loud but its there, clanking sound from engine when its started and for a couple of minutes... What ive heard from a old guy in a workshop for US-cars he said its a common sound on these engines.. And i was gonna change oil to see if it gets any better - he said to me; use Lucas 20W-50 oil and replace 20% of the oil with Lucas OilStabilizer! so i bought it and change the oil yesterday but its no better- maybe worse! The f***kin oil was like suryp and the stabilizer would hardly not come out of the can! This cant be good! What would you guys recommend?? dont have any instructionmanual but a 76-oil with like 10W-40 must be a lot better or?? Feels like that s**t is to thick??

ThankYou// Johan, SWEDEN

4.0 LIMITED ZJ 1998, IRO 4,5 premium + 1,75BB, Sim beadlocks 8x15 with 33x12.50-15 Kumho MT KL71, ARMOUR , 4 x Hella 3003, 3 x towhooks.

look at www.swedenoffroad.com and www.jeepsweden.net
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Unread 08-02-2009, 04:23 PM   #2
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1998 ZJ 
Join Date: Jan 2009
Location: Stamford, CT / Rochester, NY
Posts: 4,546
Put the normal oil back in it. How many miles are on the engine? 4.0s are not known for their lack of noises.
comptiger5000 is offline   Reply With Quote Quick reply to this message

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