I've always driven using the full engine power BUT I am sympathetic and let the engine reach full temperature for a while first. With a cold engine I am extremely careful not to labour the engine but not to over-rev (say, no more than 2500-3000 revs) until warm.
I don't like using too high revs (except my Honda VTEC I had) but I will use full throttle and have the engine pulling hard through the gears.
I can honestly say I've never 'ruined' any of my engines btu am very careful about oil changes and being kind to them when cold.
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2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
2018 Infiniti Q30 1.6T Business Executive (what's this button do?)
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