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zzm9980
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Postby zzm9980 » Tue, 26 Mar 2013 11:12 am

Wd40 wrote:
zzm9980 wrote:
offshoreoildude wrote:
zzm9980 wrote:
offshoreoildude wrote:Subarus routinely last 20 years and 300,000 km no problem


I've seen 300,000 *miles* on more than a few of the older non-turbo Impreza models in the US. And that's in harsh mid-west climate.


Well mine's a turbo but my very light footed wife does most of the km/miles now so I think it will last a long time yet.


Keep that oil clean and install an oil cooler (if it doesn't have one already).
Given Singapore's heat I'd even consider a turbo timer to prevent oil coking.


Dont worry nothing will happen. Car RPMs are how much? 4000-6000?
Motorcycles run at 8000+ RPM at highway speeds and require much higher cooling, yet air cooling does the trick.

But I agree with your point, change oil frequently for cars every 5k and bikes every 2k Kms


This has absolutely nothing to do with the car's RPMs, and everything to do with a turbocharger and how it operates.

Turbochargers use the engine's oil as coolant, and regularily run at extremely high RPMs, some in the 100k+ RPM range. A small OEM turbo charger can get orange or even white glowing hot during normal 'spirited' driving. Turning off the engine immediately stops engine oil circulation and the oil inside the turbo charger 'cokes' (not cook) and it can break down, clogging the turbo charger, and losing its protective properties for the rest of the engine. So you leave the engine idling for a few minutes before you shut it off to keep oil circulating while the turbo charge cools off.

A turbo timer is a small electronic box that will keep the car idling after you take the keys out for a specific period of time (my old one was 1-6 minutes depending on how long you drove the car), and then shut off the engine after. Any attempt to hit the break, or change the gear will kill the engine immediately.

http://en.wikipedia.org/wiki/Turbo_timer

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zzm9980
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Postby zzm9980 » Tue, 26 Mar 2013 11:13 am

Strong Eagle wrote:
But I agree with your point, change oil frequently for cars every 5k and bikes every 2k Kms


This is really a waste of money and environmentally poor policy. You don't need to change your oil any earlier than 8,500 km, and more than that if you run synthetic... at least 10k. Same for motorcycles, unless you are running a 125 cc buzzer that has its throttle wide open all the time... then mayb 5k... but 2k? Ridiculous.


I've seen 10k miles now for synthetic in the states. That said, the rules are still different with turbochargers due to their use of the same oil supply as a coolant.

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x9200
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Postby x9200 » Tue, 26 Mar 2013 12:24 pm

If it leaks or burns oil 2k may be not frequent enough :)

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zzm9980
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Postby zzm9980 » Tue, 26 Mar 2013 3:51 pm

x9200 wrote:If it leaks or burns oil 2k may be not frequent enough :)


My first car burnt through a quart or two of oil every ~800km. I was 16, and that car (Honda Civic) cost me less than most 16yr olds here pay for their mobile phones. I think I'm starting to understand why locals hate us :)


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