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Here is something to think about . The saying you should not switch brands of motor oils was true at one time. Some Oil companies used wax based products in the oil to make it viscous (thicker). Not a good thing!!! So changing it around 3000 or so miles is good and wise.
The reason for changing non-synthetic oil is it breaks down do to heat and gets contaminated with acids and ash from the residue that gets by the rings during combustion. These contaminates will corrode and etch the machined surfaces in the engine and cause bearing failure and premature wear.
Synthetic oil is a bit different it does not break down. Originally developed for jet engines that produce very high temps and spin at 30,000 rpm's or better, standard oil would not do. Some of the benefits is it really does not break down so in jet engines you dont change the oil unless water gets in it. Automobiles on the other hand still have contaminates from combustion so you have change it. I will point out though, several boat and car racers I know do not change the oil, only change the filter. I dont recommend it but there are people who swear by it. I change my synthetic every 7000 miles, if you change it every 3000 miles or so you are wasting oil. But hey its your money and your right to change your oil as much as you want. There is no major difference in synthetic oil so any brand is OK to use. For me I prefer Castrol but thats just me.
Corey
The reason for changing non-synthetic oil is it breaks down do to heat and gets contaminated with acids and ash from the residue that gets by the rings during combustion. These contaminates will corrode and etch the machined surfaces in the engine and cause bearing failure and premature wear.
Synthetic oil is a bit different it does not break down. Originally developed for jet engines that produce very high temps and spin at 30,000 rpm's or better, standard oil would not do. Some of the benefits is it really does not break down so in jet engines you dont change the oil unless water gets in it. Automobiles on the other hand still have contaminates from combustion so you have change it. I will point out though, several boat and car racers I know do not change the oil, only change the filter. I dont recommend it but there are people who swear by it. I change my synthetic every 7000 miles, if you change it every 3000 miles or so you are wasting oil. But hey its your money and your right to change your oil as much as you want. There is no major difference in synthetic oil so any brand is OK to use. For me I prefer Castrol but thats just me.
Corey