the oil will not break down as quickly but it will still break down and the filter only can catch so much before it's 'full' and all the dirty oil is just passing through the bypass valve. personally, after a lot of my own research, i would recommend changing conventional oil every 3k miles and synthetic every ~6k.
People with economics degrees will typically make around $70,000 to $115,000 at their peak. If you have a finance degree, then you can expect around $65,000 to $170,000. At the same time, this entirely depends on your position. For example, some less motivated finance degree holders work for years as bank tellers.
In all of these cities, the average salary for an economist is over $100,000 annually, and in the top three cities, it is above $120,000 annually. The type of employer who hires you also plays a big role in what you can expect to earn with a degree in economy. According to studies, the top paying types of employers are: 1  Monetary Authorities/Central Banks: $125,790. 2  Depository Credit Intermediation: $125,570.