
Originally Posted by
niky
30-45 minutes is not enough time for the engine to get ice cold. May init pa sa coolant at engine oil kung ganyan lang, and there's still a good coat of lubrication on the engine internals, as it hasn't all dripped back down into the oil pan, yet. I wouldn't worry about it. That isn't a "cold" cold start. Starting in the morning... that's a "cold start"... with the oil cold and heavy and sitting in the bottom of the sump.
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Typically short trips ARE bad for the engine... but as long as you adjust your oil change schedule to suit, it shouldn't be too much of a bother. As most local dealers force you into what Americans and Europeans would consider an "Extreme" service interval, anyway, you won't see any problems over 100,000 kilometers with a modern oil.
But going out on longer trips once a week or every other week, to clear out the engine on the highway, helps.
The advice against short trips is not an invention of the fertile imagination of writers, but from the manufacturers, mechanics and engineers. Short trips mean more cold starts, more moisture condensation in the oil, a greater possibility of fuel dilution in the oil, EGR build-up, etcetera.
This is why, when buying secondhand, it's not always absolute mileage that counts, but where that mileage was accrued. I would rather buy a 100,000 kilometer secondhand that was used for long trips in the province than a 100,000 kilometer secondhand that's sat in Manila traffic all that time. The "promdi" car will be in much, much better condition... and it's likely that thanks to all that highway running, the engine will be better broken in, and will make more power.
If you only keep your car three to five years... no worries. But if you're a practical person and keep it for 10 years or 200,000kms or more, paying attention to oil condition and running conditions pays in the long run.
Saves you money, too.
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RE: Warranties: Other countries offer longer warranties because they have less traffic. I've posted this here before, but even in cities with the worst traffic in the US, their average speeds are two to four times as fast as the EDSA rush hour average, and many Americans drive almost purely on the highway, where you can make a car go over half-a-million kilometers with little worry.