2004 wrangler 4.0 4k oci 100k + Castrol gtx hm

[Northeastfrontier]

 

[jeepman3071]

Looks good! Their comments about head gasket/cylinder head cracking aren't really relevant since that impacted mainly some 99-02 cylinder heads. It was a non-issue by 03/04.

 

[fantastic]

Like it shows here you're doing a bit better than universal avg. of 24 PPM iron in 3900 miles. These engines can last a long time though so it's no issue. I suppose the Jeep is much lighter than say a Grand Cherokee with this same engine.

 

[JavierH19]

I think I'd go to a 40 grade. It thinned and an older engine would appreciate it. But overall not bad.

 

[motorguy222]

This oil thinned quite a bit.The PDS lists its viscosity at 11.7 and it dropped to 9.82 which isn't in grade.

 

[addyguy]

9.82 is still in grade for a 30-weight oil, although just.