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Old 06-24-2015, 09:35 AM   #1
ChildlikeWonder OP
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15w-50 oil for the Boxer (Motorex and BMW VOAs)

In case anybody is curious

BMW branded 15w-50 (the current Made in Italy red stuff)


Motorex Boxer 4T 15w-50


These were fresh oils straight from the bottle. Not sure what that iron, silver, and silicon are doing in the BMW oil.
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Old 06-24-2015, 10:20 AM   #2
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Silicon is used as an additive. It is also a contaminant. Too much is no good but that is well within the acceptable range for a synthetic engine oil.
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Old 06-24-2015, 10:29 AM   #3
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Uoi

On the Ams Oil same weight but this was run for almost 10K miles in the GS.
Interesting comparisons.

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Old 06-24-2015, 10:37 AM   #4
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Quote:
Originally Posted by ChildlikeWonder View Post
In case anybody is curious

BMW branded 15w-50 (the current Made in Italy red stuff)


Motorex Boxer 4T 15w-50


These were fresh oils straight from the bottle. Not sure what that iron, silver, and silicon are doing in the BMW oil.
Low TBN. Not in my boxer engine.
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Old 06-24-2015, 10:38 AM   #5
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Originally Posted by DSM8 View Post
On the Ams Oil same weight but this was run for almost 10K miles in the GS.
Interesting comparisons.

This oil would likely be fine for seversl thousand more miles.
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Old 06-24-2015, 10:46 AM   #6
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You can't really tell anything from virgin oil TBN since they don't all degrade at the same rate. With a 6200 mile change interval, I am sure the TBN numbers are enough. In fact, there are reasons to favor a low TBN when possible anyway (see http://papers.sae.org/2007-01-3999/)
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Old 06-24-2015, 12:19 PM   #7
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I have to be honest; all these numbers (when it comes to oil) mean very little to me, without someone else deciphering the data for me I can't make heads or tails of any of it.
I'm a simple person, the manufacturer tells me the specification of the oil that my machine requires and I go out and buy it, not often do I purchase my oil from the dealership as their prices are usually too far out of whack.
I believe that a lot of the attributes regarding oil quality mean almost nothing if you change your oil at the recommended intervals.
That is not to say that I don't find oil threads fascinating and try to learn something from them
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Old 06-24-2015, 12:31 PM   #8
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I have to be honest; all these numbers (when it comes to oil) mean very little to me, without someone else deciphering the data for me I can't make heads or tails of any of it.
I'm a simple person, the manufacturer tells me the specification of the oil that my machine requires and I go out and buy it, not often do I purchase my oil from the dealership as their prices are usually too far out of whack.
I believe that a lot of the attributes regarding oil quality mean almost nothing if you change your oil at the recommended intervals.
That is not to say that I don't find oil threads fascinating and try to learn something from them
Well, I think the take away here is that while Motorex's fancy bottled Boxer 4T was developed with AC Schnitzer, it looks like it is a worse oil albeit a slightly more pure oil.
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Old 06-24-2015, 01:21 PM   #9
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I have to wonder how these numbers compare to Mobil-1 15W50 which is probably the most used boxer oil, so I found this almost 4 year old oil report on virgin Mobil-1.
Can someone help me understand how this compares?

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Old 06-24-2015, 01:52 PM   #10
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I have to wonder how these numbers compare to Mobil-1 15W50 which is probably the most boxer oil, so I found this almost 4 year old oil report on virgin Mobil-1.
Can someone help me understand how this compares?

This Mobil1 15w-50 VOA is typical of a high quality synthetic engine oil rated SN. The previous Amsoil UOA shows almost equal quality after 9900 miles in the boxer engine. I would say the Amsoil is better oil for the boxer than the Mob1. However, we're comparing oranges to onions here, used oil vs. new oil.

I still like Mobil1 15w-50 because it is available at relatively low cost. There are better oils however.

Jet, you are right...use the correct rated/vis oil in your boxer, change at the recommended intervals and it is unlikely you'll ever have an engine related failure.

You're clear for takeoff.
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Old 06-24-2015, 03:31 PM   #11
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I would say that Mobil 1 that was analyzed is pretty good - low detergent, which is fine for the change interval called for, good amount of anti-wear additives.
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Old 06-24-2015, 06:57 PM   #12
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I use Mob1 15w-50 and change annually regardless of miles. The used Mob1 is then used a bar oil for the chainsaw.
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Old 06-25-2015, 09:59 AM   #13
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I use Mob1 15w-50 and change annually regardless of miles...
Amen to that one, brother. Mobil 1: readily available; relatively inexpensive; and real good. I've run it exclusively in bimmers and beemers for decades with nary an issue.

As noted, the "used" oil can be recylced into less expensive machinery. My lawn mowers have only ever been filled with oil taken out of BMW products. Well, at least since I could afford BMW products.
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Old 06-25-2015, 10:18 PM   #14
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Ok... I am probably going to catch hell for this one.. I have a lot of time to sit and wonder.. And this seems like the group to ask...
If I had equal parts 10w-40. And 20w-50, and mixed them together would that be 15w-45 .... Or am I way off base... Not sure how any of that works....

Thanks in advance ...
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Old 06-26-2015, 02:56 AM   #15
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Ok... I have a lot of time to sit and wonder.. And this seems like the group to ask...
If I had equal parts 10w-40. And 20w-50, and mixed them together would that be 15w-45 .... Or am I way off base... Not sure how any of that works....

Thanks in advance ...
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