[justpete]

Originally Posted by dstrickland

Are BMW's OCI's still 17K, I know they may change them for specific cars & customers on "by basis" level, but in general is 17k still the standard?

It would be interesting to see an analysis between 2 of the same engine after high miles(120K+), one with a "compatible full-syn" with short oci, another with BMW's oil during their oci.

I think they were 12K on the e9x and are now 10K on the F30, and F10 as it turns out.

It would be more interesting to see how many original owners hold their cars until rolling over high mileage versus how many secondhand owners. The point being that the latter have no control over the wear incurred by the former making it somewhat unlikely to extend the life of the car simply by the choice of oil and OCI.

I think all one can do is to use the correct viscosity for their region and driving habits and to change it as often as they can afford. Not a whole lot else one can do really.

A Blackstone analysis just tells you about the interval since the last oil change, nothing prior. So you'd have to run them at each oil change for a significant period of time to evaluate what your PM schedule is actually accomplishing.

Makes sense for a race engine or one that's tracked regularly but otherwise doesn't seem all that useful, ymmv of course.

[STR8-6IX]

Originally Posted by mecbain

I'm sold to Castrol and very frequent oil changes, never had a engine failure with any of my cars no matter how hard I beat on them and me or mechanics that work on the car are always impressed how clean the engine is when let's say changing the vcg, also when I have oil leaks seems to leak less with the Castrol versus other oil of same weight, so yeah as I said I'm sold to Castrol lol

Castrol is a decent choice, but not the best. someone on this thread mentioned that castrol "shears" and degrades to a lower oil weight after about 2000 miles or so. IMO, oil weight is also important, not just oil brand. if you drive the car hard, Motul 5w-40 would be best I think.

[sprp85]

Originally Posted by 6IX-F10-N52

Castrol is a decent choice, but not the best. someone on this thread mentioned that castrol "shears" and degrades to a lower oil weight after about 2000 miles or so. IMO, oil weight is also important, not just oil brand. if you drive the car hard, Motul 5w-40 would be best I think.

I think you mentioned that you noticed shearing of your oil, no?

[STR8-6IX]

Originally Posted by sprp85

I think you mentioned that you noticed shearing of your oil, no?

yes, is closer to a 5w-30 weight after about 3-4000km. good racing oils dont shear as much.

[tlow98]

Originally Posted by 6IX-F10-N52

yes, is closer to a 5w-30 weight after about 3-4000km. good racing oils dont shear as much.

How did you notice it?

[e90dum]

Originally Posted by dstrickland

Your Mobil 1 0w-40 is completely fine for 5K-7.5K intervals

about that

[F22_Raptor]

http://www.ebay.com/itm/351481073053

Ill try this oil next, ive only used Castrol 0w40 so far.

[bimmerquick43321]

anyone tried the PENTOSIN 8043107 5W-30-HP ?

[STR8-6IX]

Agreed with the guy above me. Frequent oil changes (NOT following BMWs ridiculous oil change intervals) is the key to maintaining a healty motor and unarguably more important then what type of oil you are using. if its not Mobil 1, and the proper weight for your driving style (0w-40 will be just fine for normal driving, especially in cold temps) although I've been using 5w-40 with good success. I was always sold on castrol for quite a while, but due to the fact it shears more then it should, its a perfectly fine choice for your typical spirited driving but not ideal on the track. Anyone hear have experience with Motul? I think this is what ill be using next.

[hassmaschine]

There's really no evidence that following the CBS causes engine damage or reduced life. We have members on this forum with 300k+ miles as proof.

[Zajac1]

Originally Posted by 6IX-F10-N52

Agreed with the guy above me. Frequent oil changes (NOT following BMWs ridiculous oil change intervals) is the key to maintaining a healty motor and unarguably more important then what type of oil you are using. if its not Mobil 1, and the proper weight for your driving style (0w-40 will be just fine for normal driving, especially in cold temps) although I've been using 5w-40 with good success. I was always sold on castrol for quite a while, but due to the fact it shears more then it should, its a perfectly fine choice for your typical spirited driving but not ideal on the track.

I did not hear any experience with Motul, but from what their brochure says your engine hp might increase 7.2 compared to competitors.

[STR8-6IX]

Originally Posted by hassmaschine

There's really no evidence that following the CBS causes engine damage or reduced life. We have members on this forum with 300k+ miles as proof.

so you're telling me that going 15k on an oil change is perfectly fine?

[iahawkeye]

On this motor under non track use. Absolutely. The n52 is easy on motor oil. On a turbo car.... That's malarkey

[hassmaschine]

Originally Posted by 6IX-F10-N52

so you're telling me that going 15k on an oil change is perfectly fine?

sure - if the oil quality and use means the oil is still in good condition.

The CBS is not a "mileage only" measurement. Actual use (miles/load) plus data from the oil quality sensor are used - so if you drive it hard all the time (track days, etc) it's going to be a shorter interval.

The hard coded limit is 30,000km (18,641 miles) but I doubt anyone ever reaches that.

[hassmaschine]

Originally Posted by iahawkeye

On this motor under non track use. Absolutely. The n52 is easy on motor oil. On a turbo car.... That's malarkey

again, it's based on use and actual measured data from the sensor. People saying change it every 5k are basing it on hearsay and "gut feel".

[alx.]

Running Motul 5w40 in my n52 and it does wonders. Would recommend it 100%

[STR8-6IX]

Originally Posted by hassmaschine

again, it's based on use and actual measured data from the sensor. People saying change it every 5k are basing it on hearsay and "gut feel".

last time i changed my oil at 5k miles it was BLACK and long overdue. will be following 4000-4500 miles changes now.

[VP-jiminy]

I think as long as you pick any oil that's LL-01 approved, you're good to go. It amuses me to hear people split hairs over this brand or that.

A couple of folks here have mentioned the Liqui Moly brand (got the Special Tec 5W-30). I'd heard of it, and finally tried it for my last oil change two months ago. I like it! The oil level indicator is still at the full mark even after 3,700 miles, whereas a couple of other brands I'd tried before, eg Pentosin and Castrol, showed some level of consumption by that interval.

Did the Liqui Moly Oil Flush treatment in the past. Still have to try to Liqui Moly Jectron treatment for injectors and valves one of these days.

[sprp85]

Originally Posted by 6IX-F10-N52

last time i changed my oil at 5k miles it was BLACK and long overdue. will be following 4000-4500 miles changes now.

I am surprised you are able to tell the oil was long overdue by just looking at its color.

"It is a common misconception that an oil's color is an indication of how dirty it is. This is absolutely NOT TRUE. The color of an oil does not have any bearing on its lubrication ability. Most oil and especially diesel engine oil will turn black in the first few hours of operation due to contaminates generated by the combustion process and soot particles. The ONLY way to accurately determine an oil's lubricating value or contamination level is through (spectrographic) oil analysis."

Quoted directly from an Amsoil authorized dealer's site......

[Terraphantm]

Originally Posted by 6IX-F10-N52

last time i changed my oil at 5k miles it was BLACK and long overdue. will be following 4000-4500 miles changes now.

That's meaningless. It's not the 1980s anymore. Modern oils turn black very quickly because their detergents are actually doing their job. It has zero relevance as to whether or not the oil is still effectively lubricating the engine.

[e90dum]

Originally Posted by 6IX-F10-N52

last time i changed my oil at 5k miles it was BLACK and long overdue. will be following 4000-4500 miles changes now.

lmao if you want your oil to look the same as when you first put it in the car you should be using the mobil1 0w40 that you are deterring me from :P

[STR8-6IX]

Originally Posted by e90dum

lmao if you want your oil to look the same as when you first put it in the car you should be using the mobil1 0w40 that you are deterring me from :P

lmfao, what can i expect if the oil gets dirty that means its doing its job.

even if the oil is black. yet still protects the bearings, dirty oil signifies that it is contaminated/dirty and should be changed anyways. all im saying is if my oil was watery black and quite sheared down at 5000 miles, i dont even want to think whats gonna happen to my engine at a 15k oil service interval. there are absolutely no ifs or buts about that.