Knut79 t1_irjh5v2 wrote on October 8, 2022 at 6:23 PM

Reply to comment by SatanLifeProTips in Germans ZEDU Car Is Most Environmentally Friendly Vehicle In The World by Educational_Sector98

How does brake pads in an oil bath work at -20 to -30 and less celsius?

SatanLifeProTips t1_irjhk0h wrote on October 8, 2022 at 6:26 PM

Same way your engine starts at -45. Pick the right oil.

Modern synthetic oils flow at extremely low temperatures just fine.

Knut79 t1_irji63y wrote on October 8, 2022 at 6:31 PM

Except engines run extremely bad untill the motor gets warm, motor heaters should be used to reduce excessive wear on the engine during startup and warmup in winter, for diesels a webasto is a preferable solution as it doesn't need electricity, and also because diesel cars may not even start without warming up first.

SatanLifeProTips t1_irjl2qf wrote on October 8, 2022 at 6:55 PM

‘Engines running poorly’ when cold is due to condensation of fuel on the cold cylinder walls. Vapour fuel burns, liquid fuel does not burn. That’s why the choke plate added extra fuel on a carb and why your fuel injection needs a coolant temperature sensor to do the same. Nothing to do with cold oil.

The oil flows just fine now. Modern oils have solved those flow problems. Especially synthetics.

Knut79 t1_irjlixg wrote on October 8, 2022 at 6:59 PM

If only there was some way to look at the oil in winter and see that it has reduced viscosity as is closer to honey than motor oil...

I don't know... Maybe a stick that also could be used to measure oil level... Seems far fetched.

SatanLifeProTips t1_irjm1b4 wrote on October 8, 2022 at 7:03 PM

Or just read the bottle or better yet the SAE engineering data? These are published numbers.

Knut79 t1_irjmazk wrote on October 8, 2022 at 7:05 PM

Have you even checked a metering stick at -30?

SatanLifeProTips t1_irloeo5 wrote on October 9, 2022 at 5:30 AM

Yes. I also use synthetic oils so that is a non issue. Read the cold weight if your oil. A 15w40is going to be thick. But then you get into a modern 0w40 and it’s super thin when cold. It’s not like gear oil with it’s ‘channel temperature’. And anyone out in the frozen nothing is buying the right oil.

A wet braking system would be using a super thin oil. Like ATF. You don’t want a film like engine oil. That’s what crank bearings use to not contact the metal underneath.