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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-13-2011, 08:27 AM   #1
steve barry
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Smile Steve from australia

What is the best oil to use in a 320i ? I live in south east Queensland Australia
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Old 07-13-2011, 08:31 AM   #2
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Cooking oil.





























But really the best oil is what is reccommended by BMW. A lot of people use Mobil One
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Old 07-13-2011, 08:33 AM   #3
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Oil from dealer, or read 10,000 posts here on oil and even then you won't get your question answered.

No one knows what the best oil to use is...except, maybe Sprintman, your countryman.

Also, as you're new here, I'll just say ignore most of what comes next...if it does...and do your best not to cry, don't lash out, and if you can, entertain us!
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Old 07-13-2011, 09:18 AM   #4
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Any API/SJ or higher grade 5w-30 / 5w - 40 will do

It does not need to be anything special.

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Old 07-13-2011, 02:53 PM   #5
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Look here http://www.bimmerfest.com/wiki/index...ook_out_for.3F there is a list of BMW approved oils.
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Old 07-13-2011, 03:41 PM   #6
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Originally Posted by optrs View Post
Look here http://www.bimmerfest.com/wiki/index...ook_out_for.3F there is a list of BMW approved oils.
We have two lists here, slightly different, most unavailable...

But, get used to using advanced search/title search "approved oils" will get you the two lists I've seen here. Know they're both oldish now, and so you might also read the threads...but OE oil is regarded as among the best, and usually the least expensive.
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Old 07-13-2011, 03:45 PM   #7
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Any API/SJ or higher grade 5w-30 / 5w - 40 will do

It does not need to be anything special.
Many here have different opinions...but it 'should' be an LL-O1 oil...if you don't see LL-01, most here have learned as I did, that you shouldn't buy it.

We have oils ranging from 0/30 to 5/40 that are approved. Of course, you can put anything 'unspecial' in, save a few bucks now, and 'maybe' run into issues, maybe not and just shorten the life of the engine, or burn more, or leak more...

Oil is pretty important and there's a lot to it. Either go OE or read a lot...it's a very important fluid, right up there with the holy blue cooling water!
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Old 07-13-2011, 04:24 PM   #8
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You're gonna want to use a 30/70 mixture of acetone and bacon grease. The acetone helps clean out all of that nasty sludge, which your bacon grease leaves behind when it lubricates everything and keeps thing running smoothly!

Also, before a long drive, be sure to add a cup of plasti-dip to reinforce the engine to prevent any damage.

Good luck OP!
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Old 07-13-2011, 10:19 PM   #9
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Originally Posted by 2filthy3 View Post
Any API/SJ or higher grade 5w-30 / 5w - 40 will do

It does not need to be anything special.
Stick to your day job please! for OP oil needs to meet LL01 spec.
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Old 07-14-2011, 01:27 AM   #10
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peanut oil from mccas!
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Old 07-14-2011, 01:34 AM   #11
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axle grease
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Old 07-14-2011, 02:07 AM   #12
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Im going to use a castrol product seeing my oil cap says castrol on it
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Old 07-14-2011, 03:04 AM   #13
2filthy3
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Stick to your day job please! for OP oil needs to meet LL01 spec.

I would be simply astounded if such an oil caused a problem in a 320I.

Though I must admit that I did not consider that some people run their oil out to the extended service intervals, hence the long life. my situation usually results in annual oil changes, not based on mileage.



The study of tribology was part of my university degree.

Part of my day job is analysing oil test results, and then deciding if 10's of thousands of litres of oil need replacing in multiple systems.
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Old 07-14-2011, 04:38 AM   #14
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Good so you can explain LL01 and the min viscosity and HTHS it has to meet as well as Sequence IIIF etc etc? I also have been studying lubrication for 15odd years and we can cover TFOUT, ISOSYN process, rise of Group III basestock in most syns these days, and more. Will be good to have somebody who actually understands oil on here for a change.
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Old 07-14-2011, 06:46 AM   #15
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Tribology was only part of my learning. I have previously seen your posts, and know I would be a fool and liar to compare my own knowledge to yours.

The industrial engines I come across run many thousands of hours under arduous conditions with no oil changes, with a good VII or shear stability, the additive packages, TBN, oxidation, Blah blah remain in check for periods of time that surprised me.

I admit I did not think about service interval, I would certainly not recommend a cheap oil and a possible 20,000km service period. My mistake.

I know it's hard to say, but at a guess how far do you think a cheap SJ mineral oil would go before VII breakdown, or a CHEAP synthetic before possible additive depletion, I know it's a terrible question, and i have given no operating conditions, but I'ts something I am curious about
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Old 07-14-2011, 07:05 AM   #16
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2filthy,

I'll just say that since neither you nor Sprint is a tribologist (though he's as close as we come here!), why not just trust that the tribologists that were involved in spec'ing our motor's requirements, actually knew what they were doing when they gave us specs and approved oils.

Also, since it hasn't come up in this thread, I'll also mention that much evidence suggests that running a synthetic for longer, actually has benefits that dino oil doesn't give. There's a film that develops which coats our engine like an internal wax.

I used to hate to see dark oil...now, when my oil looks like espresso, I think "great!"

Anyway, I don't think any of us would fair too well arguing with the team of engineers and scientists that weighed the evidence and developed standards for our cars' parts, including fluids.
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Old 07-14-2011, 07:06 AM   #17
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Local BMW dealership had an engine replacement to do after 40,000kms odd without oil change. BUT I don't know what oil was in the sump. M1 0W40 shears to a 30W after a fair amount of time then thickens back to a 40W after more time. Very few 5W30's available here unlike the U.S so far less chance of non LL01 oil in the engine. Stealerships supposedly use Castrol Edge 0W40 now, replacing M1 0W40 used for many years but I heard one using 10W40 which doesn't meet spec. I don't trust any except my indy shop owner who is a perfectionist and does what I ask every time.
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Old 07-14-2011, 07:29 AM   #18
2filthy3
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dmax -I would hide under a hot rock rather than argue with mr/mrs bmw engineer.

I think i may have had some left-over thoughts coming out from other discussions with other people.


Sprintman - 40,000km wow, that's a decent effort, I would have liked to have seen inside the engine.

Indy shop, I am unfamiliarly with this term?

Castrol informed me that edge 10w-60 is suitable replacement for TWS 10w-60, so I use that.
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Old 07-14-2011, 08:15 AM   #19
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What is the best oil to use in a 320i ? I live in south east Queensland Australia
Wait for the Supercheap Auto 20% off everything sale.
Buy two 5 litre containers of Mobil 1 0W40.
Get an OEM oil filter.
You're good to go.
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