Royal Purple is a scam. It is 7 bucks a quart for 10w30? Sure synthetic oil is good, but with the 3800, not many people run pure synthetic anyway and the motors last over 300,000 not at all unheard of, Even people that dont change the oil nearly as often as they should still have good results with just about any generation of the 3.8s and a lot of other modern engines.
I see NO REASON to run pure synthetic in our cars, For the added price, lets say you pay the average for a normal synthetic we are talking 6 bucks a quart and you buy the walmart stuff for 1.50 a quart. Lets say your motor takes 5 quarts...cost of synthetic is 30 bucks when the cost of regular oil is $7.50.
You want your motor to last 100,000 miles.
You change your oil every 4000 miles.
25 oil changes, you save $22.50 each time, that is over $500 saved by running regular oil, is it really worth it? a low miles 3800 can be obtained at a yard in the $300-$500 range. What if you need to replace your motor anyway at that time for an unrelated failure such as a UIM? I see NO POINT in running expensive oil period. However I do run synthetic blend and I change it about every 4000 miles at the max since most of my driving is in the city.