I recently moved and cannot find my warranty paperwork for the 3.8 Jasper re-manufactured engine we swapped in the 2007JKU.

I remember talking to the sales rep a while back and her saying the recommendation from the warranty department was 5-20 semi synthetic.

does anyone know for certain what it calls for?

and,,,, every 3000 miles or 5000?

thanks.

 

5w-20 is the specified oil for Jeeps from Jeep. A reman engine should use the original recommendations.

 

Right. But,, will it void jasper warranty to use conventional vs semi synthetic and 3000 or 5000

 

Best solution, Call Jasper Tech or warranty dept. IMO any oil meeting FCA Jeep certification should not void the warranty. Save receipts.