is synthetic oil, pennzoil, mobile 1, or royal purple good for a mazda 6i? Good and Bad

Synthetic Oil is a superior engine lubricant. All the lubricant particles are uniformly shaped unlike conventional oil. However there are some things you should know. Synthetic Oils are produced in one of two ways. The first way is expensive and produces a superior product. Mobil 1, Royal Purple and Redline use this expensive process. The second method is much cheaper and all other synthetic oil manufacturers use this cheaper method. The second thing you should know is that synthetic oil is more slippery and seeps thru any poorly fitting gasgets and seals in your car. For this reason, it is best used in newer cars. When synthetic oil is used in older cars, the hardened gasgets will tend to leak more oil. I have used Mobil 1 with great results for 25 years and all my cars have gone 200,000+ miles without problems. When they start to leak oil (usually at 140,000 miles) I switch to conventional motor oil because it leaks out less. This transition is does not cause any problem like a prior poster suggests. I have never used any "synthethc blend" oils since they defeat the prupose of synthetic oil alltogether.
 
You can use synthetic.

You can switch back to conventional oil later on. I ran my Kawasaki exclusively on Bel-Ray Synthetique for the first 30,000 miles of it's life. I switched to Castrol GTX. The engine was still good for another 50,000 miles. Transmission was trashed but car oil is not meant for the shared engine transmission lubrication duties that motorcycles demand.

Mixing it makes little sense. Unless you are a chemist or something you should just buy a semi-syn.

A synthetic is superior in volatility. More important than that is that a synthetic stays in grade. Over time the conventional 5W20 will degrade to be closer to a 10W15. A quality synthetic 5W20 will still have the properties of a 5W20 at change time. It has also been shown to be "slipperier".

The only real downside is cost effectiveness. Your 6i's MZR engine might last a little longer than one run on conventional oil, in fact I'm going to go ahead and say it will. But how much longer? Is it worth all the extra cost to squeeze out a little more mileage after your car has 200,000+ miles? (I've run many engines past 200,000 on conventional motor oil)
 
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