It's not recommended to mix regular oil with synthetic oil as the synthetic oil has additives and the properties that are in those additives could interact and cause the oil to destabilize and thus cause internal damage, me personally i would run synthetic oil but if u are on a budget and can oil afford regular oil stick with a good brand like Castrol or Valvoline, as for the lift i have a Rough Country X-Series lift with dual stabilizers in the front it has been a very good lift and have had none of the problems that i have heard from other members.
This is actually not true... Back when synthetic oil did come out originally they thought it not to be compatible with regular oil. However there have been studies done and shown that is perfectly acceptable to mix the two and will not cause harm. Also as everyone else dated he is probably running a synthetic blend which is perfectly acceptable as well.
Too OP..... You can run full synthetic, synthetic blend...or regular oil completely up to you. I am a firm believer in synthetic and I run 8000 Miles on an oil change running Mobil 1 full synthetic or full synthetic high mileage and would recommend you change the filter halfway through. I run the filter the whole time. I have done this on my Ram pickup since I bought it and it has 226,000 MI and bought it with 54,000 miles on it and has been just fine. Again my personal preference but I believe synthetic is better and you can run it longer. Or you can run regular oil for about half the price and change everything out around 5,000 miles. There have been many studies done on regular oil as well lasting up to and over 10,000 miles and being just fine as well. Although most people don't choose to go that long on regular oil.
As far as the lift as WJCO asked... What are you running now? As long as your setup is okay and nice and tight changing the lift is just personal preference at this point. Save up the money for a good lift or buy a good lift used if you can find one.
Again just my$0.02. I have found two lift kits so far that I have purchased online off of Craigslist and such that are in perfect shape and saved a ton of money. Might not be the smartest investment but again saved a ton of money and bought lift kits for little to nothing and give me good idea of where I want to go but I was also starting from scratch more less on one of them. In the end it's going to have to be your personal decision. Good luck
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