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View Poll Results: Fossil Oil weights
5W-20 5 2.49%
5W-30 48 23.88%
10W-30 36 17.91%
10W-40 54 26.87%
15W-40 27 13.43%
15W-50 16 7.96%
20W-40 1 0.50%
20W-50 14 6.97%
Voters: 201. You may not vote on this poll

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Old 05-12-2006, 09:38 PM   #16
Adog2107
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All I use is 5w30 Mobil 1 Full Syn...stuff ROCKS
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Old 06-20-2006, 10:18 PM   #17
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Motul 8100 xcess 5W-40 whole year
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Old 02-25-2007, 06:55 PM   #18
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castrol 10W 40. I live in the rockies, and it often gets pretty cold in the winter at 7200 ft!
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Old 02-25-2007, 07:26 PM   #19
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also saw today. Mobil 1 Full Syn 10w40(Non E/p)

labelled as new on the bottle(which is it is..they have a older 10w40, but it's a blend and not a full syn)
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Old 02-26-2007, 12:09 AM   #20
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dunno what it is but i found this

http://64.233.183.104/search?q=cache...nk&cd=12&gl=dk

i use 10w-40 in a 1.6 M43
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Old 03-28-2007, 01:44 AM   #21
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ELF full sythetic 5w30 is all i use.... engine runs smooth gas consumption is down, im happy.
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Old 04-21-2007, 01:52 AM   #22
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Temp. is usally 80-90 on a hot day. I run 10-30w
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Old 04-21-2007, 10:39 PM   #23
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im on 5w 50 now, and its much better......... i think
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Old 02-04-2008, 11:19 PM   #24
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Mobil 1, 0w-40 synthetic. California, year round.
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Old 04-30-2009, 07:42 AM   #25
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This is the perfect thread for my question.

I just bought my car a lil over a month ago. Im changing my oil tomorrow. I dont know what the guy was running in it.

I would prefer to use synthetic. Should I just put syn oil in my motor anyway? I got 139k on this b***H, and I dont want any leaks starting now.

I live in Southern Ca where the sun is shines bright and is warm as hell in the summer,(in which we are aproaching).

please, advise!
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Old 02-07-2010, 08:46 PM   #26
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5W-30 TX
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Old 02-07-2010, 09:52 PM   #27
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FUnny I could not find any 15w40 or 20w50 synthetic last time so I tried the 5w30... Ouch.
Engine sounded like a box of rocks I found some 20w50 Royal and its happy and quiet!

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Old 02-07-2010, 10:08 PM   #28
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i keep hearing so many different oil weights. so i get confused which one is the better one. what do you guys recommend for the S52? i live in southern california so the weather is usually like 60-100 degrees.

i've been using the OEM weight which is 5-30? but then used 10-30 to see how it worked out. seemed to quiet it down a bit too.
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Old 02-08-2010, 12:54 AM   #29
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BMW put a nice little chart in the owners manual.

I follow it.

Its all about the year and the bearing clearances, depending on how the rod and main bearing clearances were set and the amount of oil pressure and I suppose the phase of the moon, the viscosity affect the actions of some of the internal parts like tensioners etc.

I was told once that the first number on oil is the equivalent viscosity at 0C and the second is at 100C.

So 10W40 is the same viscosity as 10 weight oil at 0 and the same viscosity as 40 weight at 100C so I was told... Guy was a Chevron engineer...

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Old 01-13-2019, 09:36 AM   #30
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+1 on the previous post mentioning the chart.
I checked out the chart in the handbook for my '97 318ti M-Pack (Not M) with 242k Km.
It states 20w50 year round, which is about the cheapest there is. I use Castrol GTX and change it more often than the regular service interval. Temps here 10C to 40C over the year. I would not go to some of the thinnest available as the engine was never designed for it from new. 10w? Only if I was above the Artic Circle with a fresh engine.
Because of the situation with my engine I am using GTX Diesel at the moment to clean out the engine interior (more active detergent component). I anticipate changing the filter out before the oil as I expect it to become blocked - I have been caught with that before in similar circumstances.
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