Another major reason that many are choosing synthetic route is that it contains fewer impurities; impurities that can cause your engine harm, perhaps to point of premature engine wear. With conventional oil, there’s no way to totally rid, filter or clean impurities from natural elements. That’s another reason why synthetic oils do not have to be changed as much even in extreme driving conditions.

You’ll want to be careful; however, if you do decide that you want to give synthetic oils a try. If you’ve been driving your 1983 Ford Thunderbird for years using 10W30, you may not want to switch using your conventional oil brand.

Conventional oils have solvents that stick to gaskets and seals and often cause them to swell a certain way. These gaskets and seals have been used to same oil for years and switch to any other type of oil (whether it is to a different conventional oil brand, or an upgrade to a synthetic) may be harmful. The oil you change (or upgrade to) will also have solvents and additives, different from original. So in other terms, changing of oils could result in oil leaks and/or a once small oil leak becoming bigger due to reaction seals and gaskets will have to change (not because of oil itself). If you think that this might be case for you (i.e. if you have an older car using conventional oil), it’s recommended that you not try synthetic oil until you have an engine (or new car) with relatively virgin gaskets and seals that will be able to acclimate much more easily to chemical changes of newer type of oil.

It’s easy to see that that fanfare for one or other is an argument that has really been explored. It’s best for you to decide what will fit your personal needs. If you have an older car, you may want to wait until you upgrade. However, if you have a newer car, benefits of synthetic oils are easily seen. Again, it’s solely dependent upon you and conditions where you drive. Synthetics are shown to provide their best protection above 250 degrees Fahrenheit. Most people do not drive their cars this hot. However, many do drive in cities, where driving times are considered to be more of a “stop-and-go” nature, which may be considered “extreme” in many circumstances. When time comes for you to make a decision, at least you’ll be informed of differences of each. And, until that time, no matter what, keep up that automotive pride!

Fuel injected engines do not experience this problem as much as others do due to fact that fuel remains inside injectors by being under a very high pressure. This way, fuel injected engines would not become so easily obtruded by vapors as other engines would and therefore car would not have same problems to start as another would.

Also, engines might become hard to start while being hot if it coincides with season in which refiners change from a fuel blend to another. Sometimes gasoline refiners change from a higher volatility fuel to a lower one when summer approaches due to way in which hot weather causes fuel to evaporate easier. If refiners change back to a higher volatility fuel while engine is still exposed to days of high temperatures, this could cause fuel to evaporate too much creating too much vapor and therefore obtruding engine.