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Don't believe so. That's all that I'll run in mine.

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Interior: Color matched trim, complete LED swap | Exterior: 5% limo tint, black emblems, black painted headlights, 20" Fuel Hostages, 37" Mud Grapplers, tow mirrors, tow hooks | Performance: Yukon 4.56s, Vararam Intake, DiabloSport Trinity, Raceland USA e-cutout, BT Catch Can | Lift: 6" Pro Comp lift, 1.25" RCX body lift, Bilstein 5100s set at 2.8" | My Pictures

I use it in my Magnum RT with a Mobil-1 Filter and I plan to go 4-6 Months (No more Warranty-Yes!). I only drive her 6-7 Months a year. Just started using it at 30K Miles before I parked it. Some will argue and recommend that the Motor should have some Miles on it first before switching from Conventional. But there must be plenty of fourth gens out there that have run it since new like Kevin without any reported problems.

My Ram is too old for that kind of a blood transfusion so I stick with Castrol High Mileage and a Mopar Filter.

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6.1 Cam/Springs/Rods/Oil pump-SC3865-85 mm Ported TB W/Grnd-K&N-Pwr Wire-E-Fan-Hooker Headers-Flo Tech Y Pipe-Magnaflow 18" Dumped-B&M Shifter-TCI 2600 TC-Transgo HD w/Resist-TMR Delete-HD Cooler-Auburn LSD 4.56's-Mopar Cover- Modest 3" Lift-SRT Hood-RF Tactical Grille-Blk Lights-Cab Lights-OEM Hella Fogs- PWR WGN Flares-Black Bed Caps-Rails & Mopar 4" Step Tubes w/5x Amber-1OAK Steel Rims/285 Duratracs-Gator Mudflaps-Rolling Tonneau-Leather. Next:Hellwig-35's.

The 07 I sold this year got nothing but Mobil1 Synthetic for the 58k miles I owned it and the 2011 gets nothing but Mobil1 Synthetic. Never had a problem

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No there is no reason not to. IMO all vehicles can benefit from Synthetic and by not running it you are missing out.

Chrysler recommends 8000k on an oil change using Dyno oil imagine what you can do with synthetic and a really good filter. I do 10k oil changes now and I am not afraid.

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Thanks for all the good info

I heard that once you go synthetic, you can't go back...I mean that literally as I heard that from a mechanic. Is that true? If so, why couldn't you switch back to conventional again?

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I've never heard you couldn't switch back to conventional. Just that if you switch to synthetic on older motors, it can cause small leaks where there weren't before

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No sir nothing but Royal Purple 5w20 with a K&N oil filter for my truck! I like the good stuff for the hem dog lol.

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2011 5.7 Hemi Ram QC 4X4 Black pearl sport-Dynomax 39480 SS cat back 4" tips,K&N polished 77 CAI,3.92 gears,24x9.5 Red Sport RSW33's,305/35/24 Lexani LX-NINE tires,5% Tint,Mopar T handle shifter,Factory bed liner,Premium cloth,Dodge chrome steps, Alpine stereo,Sunroof,Dealer installed silver pinstripes,Philips 6000k HID's,Luminis G4 3000k HID fogs,K&N oil filter,Royal Purple oil,Redline water wetter.