I have continued my buying another Mopar car and this time went for the 5.7 along with my Jeep 3.6 i have now.....what would be a good oil 5w 20 I could use in both the Dodge and Jeep Grand Cherokee 3.6 im using QS syn 5w 20 in the Jeep with a Mopar filter. I was thinking of Penn ultra 5w 20 syn for the 5.7 Hemi.....