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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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View Poll Results: What weight and viscosity?
0w-30 1 5.88%
5w-30 4 23.53%
5w-40 1 5.88%
10w-30 5 29.41%
10w-40 4 23.53%
15w-40 1 5.88%
Other 1 5.88%
Voters: 17. You may not vote on this poll

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Old 04-05-2005, 10:30 AM   #1 (permalink)
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Seems like everyones using different stuff base on the forumns ive read... What does BMW Reccomend? What do you use? I always use Mobil 1, but im never sure which is the perfect weight.
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Old 04-05-2005, 10:37 AM   #2 (permalink)
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I'd like to know as well since I'm about to change the oil in my car for the 1st time. I think a lot of it has to do with how many miles you have on your car. So if someone could tell me as well that would be nice.


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Old 04-05-2005, 11:21 AM   #3 (permalink)
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The manual for the 97 328iS says 15w40 in normal temperatures for summer. and 10w30 for really cold winters, like -20F.

The 15w40 around here is diesel and gasoline rated, but should work just fine. I just put 10w40 Castrol in mine.

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Old 04-05-2005, 11:23 AM   #4 (permalink)
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I've always wondered exactly what the numbers mean. Can someone explain what the first number and second number means? I assume the "w" stand for "weight" right? Also, my car was burning oil so the oil changers put in 20w50 because it is heavier and will burn less oil.
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Old 04-05-2005, 11:41 AM   #5 (permalink)
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w stands for winter. 10w30 is a multi weight oil. By adding viscocity modifers and improvers manufacturers are able to produce an oil that acts like a 10 weight oil when cold and like a 30 weight when hot. This improves circulation when cold, to extend engine life. Straight weight oils do exist, usually SAE30 but you only use it in the lawnmower.
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Old 04-05-2005, 11:45 AM   #6 (permalink)
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Aaah, thanks for clearing that up. So with a 20w50 it acts like 20 when cold and 50 when hot?
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Old 04-05-2005, 12:09 PM   #7 (permalink)
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The numbers are indexed values of viscousity classified at set temperatures.
The lower one at 20degrees celcius(68F) I think and the higher is at 100 degree celsius (212).

All non M-models come with Castrol SLX(?) 0w-30 here.
BMW recomends Castrol TWS 10w-60 for M-models. And that is what I use.

Low cold viscousity index is pretty much allways good. Makes sure you allways get lubrication from start-up. And it provides lower friction in the engine.
You want the warm viscousity index high if you drive the car hard and get high oil temps.

Race oils are usually 20w-60, they usually warm along time on idel/low rpms so the cold index isn't that important.

The wider the spread the more expensive it is to produce.
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Old 04-05-2005, 09:25 PM   #8 (permalink)
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On my '94 325is I am using 10w40 right now for the winter oil, and then for the summer I use 20w50. Thats what my manual recommends for this climate. (Seattle)
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Old 04-06-2005, 08:03 AM   #9 (permalink)
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On my 1993 325 with 125k im using Lubro Moly 0w40 full synthetic oil, and im very happy about it, the engine revs smooth as butter and loose as a goose. Its great stuff, but its pricey. But i prefer spending 50 bucks buying the oil and changing it myself, so i know im using good stuff, that sending it to the 20min lube job..

any questyions ask

see ya.
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