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Thank you for the advice and well wishes

I just put a 4.0 in the wife's 2000 TJ from S&J in Spokane They are a very reputable company that I've dealt with for many years and installs I would recommend them

Thanks ripcord. I see you reside in PNW. Wish I was back up there sure miss it. Maybe someday.

Ok me being dumb What's spark rated and what effect does that have in oil?

What a informative article. To Duckless's point the info is 10 years old and a lot has gotten better but if you pick a few points to do your own research on I'm sure the answer will become obvious to you. Thank you Duckless for remembering this article.

In that I agree 110% regarding the suggestions and advice given here. There are a lot of really smart people on here that have spent a lifetime, however long it's been, listening to others and sharing those experiences with us. Thank you all.

Used a rebuilder in Washington where I lived and installed quite a few of their engines and had it shipped here to Nw Nevada They suggested the 10w30 and of course no recommendations as brand

Yes it is a flat tappet i6 4.0

In response to Mola Kule's question of what oil the dealership used IIRC it was either Amsoil or Mobil 1 as they were the "thing" then. I'm leaning to the Mobil 1 side though. I knew the rep for Amsoil and don't remember seeing him in the dealership very often but saw a lot of him when I began...

Yes 7 year/100k

WOW!!! What support and input. I'm impressed. Here's where my mind/experience takes me. Back in 79-80 I was working at a Pontiac/Honda/MG/Jaguar dealership using petroleum based Pennzoil until the new craze of synthetics came out. The management decided to change to the new oil mainly to comply...

Hello all. New here but not to wrenching. Just installed a reman 4.0 in my wifes 2000 Jeep TJ. Filled it up with Lucas 30w break in oil supplied my remanufacturer and told to change after 500 miles. We're at that point now and looking to do it's first oil change with Mopar filter but unsure on...