That is true for older cars without rebuilt engines. If it's rebuilt,
start and stay with detergent oil. The problem is in an old engine they
are counting on a buildup of sludge and varnish, which actually helps
the rings seal and give it good compression. Change to detergent oil
and it cleans away the sludge, reducing compression, then it doesn't run
Motor oils usually contain detergent. And detergent makes it easier for the
oil to absorb water. This isn't a problem in cars, where it gets good and
hot each time it's run. But in a cold application like a compressor, it can
absorb and hold the water.
If it's small enough and you have the space you could put it in a
heated area during cold weather. If that's not practical, check the
owners manual for cold weather oil recommendations. IME most
compressors call for straight 30 weight oil, often non-detergent.
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