>I think anything with pistons and rings should be allowed to thoroughly
break in before using synthetic.
When I bought my piston compressor I called the manufacturer about break-in
and synthetic. They told me that synthetic (Mobil 1) was fine for break-in,
but be sure to run the compressor for a length of time (one hour??) under no
load conditions (drain valve open) to fully break in the cylinder walls.
Read the manual and/or call the manufacturer for instructions. I had no
issues with synthetic for my break-in.
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