The benefits of using synthetic motor oil versus the use of conventional petroleum motor oil are well known and have been detailed here in 4WHEEL DRIVE MAGAZINE many times before. So why haven't you made the switch yet? Common perception is that synthetic oil is more expensive but truth be told, it isn't. Five quarts of Amsoil synthetic will cost you about $50 while five quarts of conventional oil will run about $20 (the cheapest SAE 10W-30 we found at press time was $3.99 per quart. A quart of Amsoil Signature Series 10W-30 Synthetic motor oil sells for $10.15). So how is a $10 quart cheaper than a $4 quart? It isn't. That is, of course, until you consider drain interval.
Using conventional oil you're looking at a recommended drain interval of every 3,000 miles. Using Amsoil Signature Series synthetic you can extend your drain interval to every 25,000 miles. Basic math tells us that we'll spend about $100 to drive 15,000 miles on conventional motor oil, if sticking to the recommended drain schedule. But with Amsoil Signature Series synthetic motor oil we can get a full 25,000 miles from a single oil fill, saving around $50 a year right there.
You'll actually save even more money than that considering you'll need three additional oil changes to get to Amsoil's 25,000-mile interval. Eight oil changes at $20 a pop adds up to $160 and gets you to 24,000 miles. So, in effect, you will actually save more than $100 and still get more miles in return. You can use that $100 savings to pay for two more drain intervals using Amsoil Signature Series synthetic. That's 75,000 miles of driving for just $150 of motor oil (three drain intervals). Compare that to the 25 drain intervals and $500 that you'd spend using conventional motor oil to accomplish the same feat.
You've likely heard the saying, "you have to spend money to make money." In the case of Amsoil's Signature Series synthetic oils, this assertion is dead on.