What oil?

[IamFODI]

What do you guys think of the latest (2013) oil bulletin from BMW on our engines?- it says a specific Castrol 5w30 is approved along with TWS

IIRC BMW pulled that soon after posting it and went back to recommending 10W-60 oil (TWS, then TwinPower Turbo). People think it's current because the threads are still floating around with their original titles ("5W-30 now allowed!" etc.) but it hasn't been for years.

[IamFODI]

Yeah, that's what I meant as somewhere, something is getting hotter if that's the case but ultimately that means the oil has to get hotter too (and since the heat transfer in this example is poor it also means it stays hotter longer and ultimately, over time, the oil will get hotter and hotter if it cant get rid of ththeheat it is exposed to)

This is what would happen if the oil were the engine's main or only means of heat rejection.

Aside from the exhaust, the engine rejects heat through the coolant, the oil, and the air (pretty sure in that order). Reducing the proportion of heat pulled away by one of those will increase the proportion pulled away by the others until one or both reach capacity.

Arith2 said his lower oil temps were when he was just cruising around. In those cases, the coolant system is WAY below capacity and should easily be able to pick up any slack.

[Flat-Six]

Purchase using PayPal, use free return shipping service from PayPal. Little known benefit, perfect for this situation.

Excellent! Thanks. I always use PP, just did not think of using their return shipping. Thanks again.

tim

[Icecream]

What do you guys think of the latest (2013) oil bulletin from BMW on our engines?- it says a specific Castrol 5w30 is approved along with TWS

I think BMW doesn't give a damn about a 20 year old platform and never really knew why the bearings failed in the first place lol.

[Carbonvert]

Up to $30 each time right? Not $30 total per year. That would only cover 2 boxes, though that's better than nothing.

I am reading it as $30 per shipment up to 12x per year. It looks like you must activate this feature.

https://www.paypal.com/us/webapps/mpp/returns/terms

https://www.paypal.com/us/smarthelp/article/what-is-return-shipping-on-us-and-how-do-i-activate-it-faq3544

What do you guys think of the latest (2013) oil bulletin from BMW on our engines?- it says a specific Castrol 5w30 is approved along with TWS

I attached both the 2013 (TWS and 5w30) and 2008 (TWS only) bulletins to this post. I ask because I see Motul 300v 5w-40 is on FCP. Always wanted to try that in my street driven car.

[Icecream]

Worse thermal conductivity in the oil means less engine heat makes its way into the oil, right? Depending on other factors (coolant system, air flow, etc.), that could easily mean lower oil temps.

BTW, I'm not saying this is necessarily happening here. I have no idea. Just mentioning a possibility.

Yeah, that's what I meant as somewhere, something is getting hotter if that's the case but ultimately that means the oil has to get hotter too (and since the heat transfer in this example is poor it also means it stays hotter longer and ultimately, over time, the oil will get hotter and hotter if it cant get rid of ththeheat it is exposed to) There are too many moving parts (literally) to be able to know exactly what's happening and where the heat is going but I guess my point is if the oil had significantly worse heat transfer then enough heat would have to go somewhere else that you would notice and I suspect it wouldnt be good forthe engine/pistons and all the other lubricated parts that rely on oil to move heat from the parts inside to the air outside. But this is all beyond my expertise since I have never tested/designed engines.
i guess the elephant in the room is that overtime (on a long drive perhaps) there must be a point where the engine would get hot enough anyway that it wouldnt matter what the heat transfer was since the engine would get very hot and over time the oil would still have to come up to temp but at a slower rate. I suspect in this situation the engine would get hotterand hotter as would the oil but at a slower rate until either the engine seized or the oil broke down or both. But that is neither here there.
my main point was that heat transfer is a two way street, gawddddd.

As for volume, that should make a difference too. That's why so many things on here and stories of quiter/smoother/cooler are anecdotal at best and should never be taken as anything more than that without real data in controlled unbiased conditions.

I use bmw/ shell now btw. It works, engine is way quieter and smoother than before and I think a couple more hp. Stereo sounds better too when I use it, probably because the battery stays cooler.

[IamFODI]

Can't the volume of oil also affect temps? Slows down the crank more, more heat? Or less heat as there's more volume to absorb the heat?

In order: Yes, theoretically but not really in practice, yes

(assuming "less heat" really means "lower temps")

[Tbonem3]

Can't the volume of oil also affect temps? Slows down the crank more, more heat? Or less heat as there's more volume to absorb the heat?

[IamFODI]

I don't think it works that way.

If it transferred heat poorly, it wouldn't cool the engine and would lead to higher temps SOMEWHERE. If anything low temps mean the oil can transfer heat better.

Worse thermal conductivity in the oil means less engine heat makes its way into the oil, right? Depending on other factors (coolant system, air flow, etc.), that could easily mean lower oil temps.

BTW, I'm not saying this is necessarily happening here. I have no idea. Just mentioning a possibility.

[Icecream]

Interesting. Thanks.

AFAIK there are three possible reasons why oil temps might be lower:

3. Worse heat conductivity

Would be interesting to try to figure out which one is happening with this oil.

I don't think it works that way.

If it transferred heat poorly, it wouldn't cool the engine and would lead to higher temps SOMEWHERE. If anything low temps mean the oil can transfer heat better.

[JamesSJ1]

have always done either the castrol or the original bmw oil. Gonna give liqui moly a try this time around from FCP. So the second time I order this from them, I can ship my oil and filter back, theyll refund me for it and recycle the oil for me? If i purchase the second one through paypal, I can utilize their free return policy to save the $15 on return shipping?

Yes, the second order needs to be through PayPal because that is technically the one you're returning that FCP will provide the refund against.

[IamFODI]

10W-60 X-Power
No additional additives or anything.

Interesting. Thanks.

AFAIK there are three possible reasons why oil temps might be lower:

1. Lower viscosity (esp. in high shear conditions), thus more flow, thus better cooling
2. Lower friction due to formulation
3. Worse heat conductivity

Would be interesting to try to figure out which one is happening with this oil.

[Tbonem3]

That is an amazing benefit. 12x per year up to $30

Up to $30 each time right? Not $30 total per year. That would only cover 2 boxes, though that's better than nothing.

[zing]

Purchase using PayPal, use free return shipping service from PayPal. Little known benefit, perfect for this situation.

have always done either the castrol or the original bmw oil. Gonna give liqui moly a try this time around from FCP. So the second time I order this from them, I can ship my oil and filter back, theyll refund me for it and recycle the oil for me? If i purchase the second one through paypal, I can utilize their free return policy to save the $15 on return shipping?

Wish I would have tried this sooner!

[Carbonvert]

Purchase using PayPal, use free return shipping service from PayPal. Little known benefit, perfect for this situation.

That is an amazing benefit. 12x per year up to $30

Oil temps with Motul on hot FL summer days are around 180-190 cruising. The only time it goes above 210 is when I spend 10 seconds above 4500 rpm. TWS was always around 215 under the same conditions. Highway cruising was 205 to 210. It also doesn't burn at all. That's all I got for objectiveness because I'm not getting that deep into it until after I take Chem. Then I'll sort of know something useful.

That is a pretty significant temp difference. TWS and Liqui Moly sit at 210 cruising during the cooler NE summers.


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