There are some common myths about motor oils passed on from person to person until they are simply accepted as the truth. This needs to be dispelled of right away. Let’s look at a couple of them briefly.
Once You Use Synthetic, You Can’t Go Back
The differences between synthetic and chemical oils are very similar, and there is absolutely no hard and fast rule that you cannot switch between the two. Do not assume that because you have used synthetic once that you are stuck with it forever.
Additives Improve Engine Performance
Additives do maintain the health of an engine, but they cannot bring it back to life. Horsepower lost over time is not magically regained due to the addition of additives.
Dark Oil Should Always Be Changed
Not so fast on this one either. Dark oil may be a sign of a problem, but many oils go dark quite quickly just because that is how they are designed. Do not be fooled.

