What do you guys trust?

[btwilson86]

Originally Posted by Semper_Fi

I wonder why people put synthetic in their cars...

I ran 0W-20 Royal Purple engine oil in my former 87 7MGTE. I had not experienced any significant loss of pressure, and in turn had a cooler, better performing engine. I switched from 5W-30 Mobil Clean 5000 conventional oil.

My reasonings for switching:

1: Extended oil life and better protection because a Synthetic oil's structure does not break down from normal use
2: Ability to reach thinner viscosity at startup, therefore providing better flow and lubrication for the engine during a traditionally high-wear period
3: *Most* Synthetic oils have been proven to adhere better to metal surfaces versus a mineral-based conventional oil, once again providing better lubrication (people may argue this point, as I have no data at hand to prove this; it's just something I've read a couple of times over the years)
4: Increased lubrication results in less friction. My engine now runs smoother, quieter, and is much more responsive vs. conventional oils I have run in my Supra.

With that said, there is a lot of bad information about what oil to run, how different oils work, and what's best for what scenario. Most people will believe what they believe for their own reasons, the only way to know for sure is EXTENSIVE research and experimentation.