Straight from the RX-8 Quick Tips manual that I found a PDF of:
Quote:
Short trip driving procedure
Any trip that is too short for the engine to reach normal operating temperature; needle in middle of temperature gauge indicates normal temperature.
The following procedure should be followed when moving vehicle
a short distance**:
1. Start engine
2. Move vehicle
3. Warm engine for 5-minutes at idle
4. Raise engine speed to 3000 RPM for 10-seconds
5. Return to idle
6. Turn off engine
Tip: Warming up engine improves engine life
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Given that the short trip driving procedure includes a rev to 3k instruction, it's likely that what you were told won't hurt you.