Longterm Heat Damage

[max]

I been talking about this forever. lol The first weight you want as thin as possible to lubricate the turbo upon cold start up as fast as you can…..

Can you imagine that turbo SCREAMING at startup when outside temp is below 50 deg. F with a heavier weight oil?????????

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[Axix23]

Can you imagine that turbo SCREAMING at startup when outside temp is below 50 deg. F with a heavier weight oil?????????

But no more oil burning……. Lmao ?

 

[puzzled]

I've never heard of anyone opening their car hoods after a spirited drive on the streets. I QD the hood first when I get home from a drive before the panel gets too hot for my sprays. That's about it.

 

[Loco38SUP]

Can you imagine that turbo SCREAMING at startup when outside temp is below 50 deg. F with a heavier weight oil?????????

You guys are funny! You act like 30w oil is molasses. Go look at what Porsche runs on their turbo cars.

I think we won’t hurt any turbo feelings by running 30w oil, mechanically or spiritually.

-RJM

 

[Axix23]

You guys are funny! You act like 30w oil is molasses. Go look at what Porsche runs on their turbo cars.

I think we won’t hurt and turbo feelings by running 30w oil, mechanically or spiritually.

-RJM

i don’t think he was referring to the 2nd number 30w oil. He was referring to the cold temperature rating of the 5w (first number)

Once again people don’t understand what the numbers even mean. On a turbo car, you always want the thinnest cold temp viscosity rating like 0w. If you want to run some thicker oil, 0w40 or 0w30 would be optimal.

 

[digicidal]

Although I'm certainly not an expert in either thermodynamics or engine design (and it's been ages since I stayed at a Holiday Inn) I hesitate to idle cool too much more than a minute or so. In idle, although the turbo isn't spinning (or barely), there is still heat being generated by the engine and there is not any airflow outside the fans... so the benefits are a bit less. When the fans run after the engine is off... there is only cooling. Sure you have to trust the sensors... and just like the oil that might be a bad thing - but as BMW isn't new to FI engines... I figure they've at least got it tuned to not blow up under most circumstances.

Cool-down laps at the track are another matter entirely, since you do have general airflow combined with the fan-forced cooling - something lacking in a longer idle cool-down.

 

[John8]

I was wondering if I’m the only demented person that opens their hood after they get home from a spirited run.

This is something I’ve done for years with my turbo cars. Does anyone else do the same?

-RJM

I always do. Heat is our enemy in this case. I also live in Tucson with fairly hot days but then much of the US is getting just as hot as here.

Odd, I just realized, my fan doesn't run after I turn off the engine. Some here have their fan continue to run for a while?

 

[Rocksandblues]

I always do. Heat is our enemy in this case. I also live in Tucson with fairly hot days but then much of the US is getting just as hot as here.

Odd, I just realized, my fan doesn't run after I turn off the engine. Some here have their fan continue to run for a while?

yes
if your fan is not running you have ZERO need to pop the hood.

Its your baby, do what makes you feel good.

 

[John8]

yes
if your fan is not running you have ZERO need to pop the hood.

Its your baby, do what makes you feel good.

Had a turbo before, 20 years. Made sure the car idled for a short while before turning it off, if I had been pushing it and it lasted a long time. I like looking at the engine anyway. :^)

If I run it in sport mode, I turn that off a couple of miles from home.

 

[romanLegion9574]

Sort of related, I did notice the engine was quite hot after a 100 degree day here in Seattle yesterday (just a quick grocery run, no hard driving), so I did pop the hood for 5 minutes for a faster cooldown.

 

[digicidal]

Obviously, regardless of whether there is an objective benefit to popping the hood or not... it's certainly not going to hurt anything to let it vent a little bit more after driving. As long as you make sure it's completely latched prior to driving again that is - if not, heat damage will be the least of your concerns.

 

[Loco38SUP]

Obviously, regardless of whether there is an objective benefit to popping the hood or not... it's certainly not going to hurt anything to let it vent a little bit more after driving. As long as you make sure it's completely latched prior to driving again that is - if not, heat damage will be the least of your concerns.

The iDrive is persistent at telling you the hood is open. It practically reaches out and slaps you if you try.

-RJM

 

[digicidal]

The iDrive is persistent at telling you the hood is open. It practically reaches out and slaps if you try.

-RJM

As it should! However, based on past experiences and many of the posts in the oil consumption thread, I think I have a bit of a "crisis of faith" as far as iDrive is concerned.

 

[underdonk]

Obviously, regardless of whether there is an objective benefit to popping the hood or not... it's certainly not going to hurt anything to let it vent a little bit more after driving. As long as you make sure it's completely latched prior to driving again that is - if not, heat damage will be the least of your concerns.

Wait... the hood latches? I wondered why it kept popping up and flying off at 130mph+. I'm on my third hood in two months.

FWIW, I'm one of those guys trying to figure out the engine oil consumption "issue," and think the 0w-20 is fine for 98% of the people out there who own these cars. They just burn oil - most cars do it to some degree. For anyone doing serious track work, using a 5w-30 is probably a better move. 5w oil isn't going to cause issues on a cold start in regards to the turbo. I have no evidence to support this assertion for this car yet, just decades of my own experience building and tracking cars. That's not d*ck waving, just what I'm basing my perspective on.

 

[MCSeverino]

Come on guys, let's be real here. The engine was designed from the ground up to work in a total amateur's daily driver. Its been tested in all manner of conditions. There is no need to lift the hood after a drive on the street. I wonder what percentage of people who have this engine in one application or another have ever even heard of opening the hood for cooling after a drive???

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