It's not a problem to change back and forth. Mobil 1 does not change anything within the engine to make it not run with dino. The only downside would be on a very old engine that was not well maintained using dino oil. If the oil was not changed regularly and seals and gaskets got hard and cracked, synth has a tendency to find it's way past them and onto the driveway because of its superior flow characteristics. Going back to dino oil will generally solve this. Do not read this to say that changing to synth is bad or will hurt the engine, IT IS NOT AND WILL NOT. Again, only on old engines that were not well maintained.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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