Originally Posted By: HTSS_TR
He wants to change his oil while he's with you so that you will pay for it ? Smart boy !!!
Use xW20 with confident, if I'm using xW20 in E430 (spec'd oil is M1 0W40 or GC) without problem, Wrangler should have no problem with spec'd oil. Actually, my E430 likes xW20 better than M1 0W40, it is much quieter and rev much easier with MPG improved by about 3-5%.
You like M1, there is no reason for not using M1 0W20 in Wrangler engine.
With the money he makes he can afford the oil. It's a father son thing. Like you, I really like the 0-20AFE in the Duratechs, so we may just go with the 0-20.