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  #41  
Old 12-07-2015, 10:39 PM
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Quote:
Originally Posted by mig25 View Post

Oil is guaranteed for 15000 Miles, I do an oil change every 6 months or prior to winter and prior to summer.
If you do an oil change every 10.000 miles your oil will still be good since it is made for 15000 miles.





Mobil 1 5W-30 is marginal at the top end of the viscosity range; the guys at BITOG say it's shear specs are really iffy to be classified as a 30wt.

Mobil 1 0W-40 is a *true* poly-alpha olefin (PAO) base stock oil. Not sure about the EP 5-30, but the 5W-30 Mobil 1 was proven to be a full synthetic blend with cheaper base stock. Still good stuff, but not the "best" by a long shot. Amsoil, Rotella and Redline make some better oils, just to name a few.
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  #42  
Old 12-08-2015, 12:56 AM
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I use Mobil 1 synthetic...5W30 for winter, 10W30 for summer.
Sometimes I use 15W50 in the summer, depending on my mood.

Sometimes NAPA has sales with synthetic at $3.50/qt, I usually buy in bulk when it is on sales.
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  #43  
Old 12-08-2015, 08:31 AM
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Best Oil

I bought my X5 a month ago.
Here is how the engine looks after the previous owner only ran Castrol Synthetic on it, oil changed every 10.000 for 126.000 Miles as recommended by BMW.




Below is the cylinder head on my previous VW VR6 on Mobil 1 Extended performance after 200.000 Miles on it... Oil changed every 10.000 miles.
Go figure which oil is better. Keep in my the VW VR6 2.8 runs super hot all the time...


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  #44  
Old 12-08-2015, 10:11 AM
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Here's an M62 (4.4L) after 100k miles on BMW (Castrol) oil (changed at full SII change light), and 80k miles on Mobil 1 0w-40 (changed at 60% SII).

Manufacturing grind lines are still visible on the cam lobes.

Over 200k miles now and still running OE timing chain guides.
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  #45  
Old 12-08-2015, 10:31 AM
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Quote:
Originally Posted by Scott ZHP View Post
Mobil 1 5W-30 is marginal at the top end of the viscosity range; the guys at BITOG say it's shear specs are really iffy to be classified as a 30wt.

Mobil 1 0W-40 is a *true* poly-alpha olefin (PAO) base stock oil. Not sure about the EP 5-30, but the 5W-30 Mobil 1 was proven to be a full synthetic blend with cheaper base stock. Still good stuff, but not the "best" by a long shot. Amsoil, Rotella and Redline make some better oils, just to name a few.

^Agree with Scott regarding the M1 0w-40 vs 5w-30 - However I've been using Rotella T6 for the last 4 oil changes and the X5 seems to really like it. I change my oil every 5k miles or once a year, whichever comes first.

The above images of the 10k oil changes on the M54 make me shudder, even though I've heard that the BMW 5w-30 is a better blend than the off the shelf Castrol 5w-30.

Liqui Moly is another great brand of oil if your wallet can handle it, but then you are also into Redline, Amsoil territory. Rotella T6 is $20 a gallon at Walmart, I also use it in my 2011 1700cc P-twin Triumph Thunderbird as it has the additives for wet clutches.

I use Redline 75w-90 in the diffs, and Redline MTL in my manny tranny. You can also use D4 ATF in the manny tranny.
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  #46  
Old 12-08-2015, 12:10 PM
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Quote:
Originally Posted by Ricky Bobby View Post
The above images of the 10k oil changes on the M54 make me shudder, even though I've heard that the BMW 5w-30 is a better blend than the off the shelf Castrol 5w-30.
I feel the same about the lengthy change interval before owning the X5. However, it has changed since. My oil change interval on the X5 averaged 9k to 10k or annual. Mine looked more like TiAgX5's the last time I opened it up for a VG replacement. It's been running BMW's Castrol during the free maintenance period and various Mobil1 from then on. Still not drinking a drop and look brand spanking new after 108k+ miles.
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  #47  
Old 12-08-2015, 12:40 PM
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I don't think it is necessary to vary from MFG. recommend oil weight range. I think most of that belief comes from the good ol' days when oil was less sophisticated, engine tolerances were greater and less consistent. In extremely cold climates using lighter weights was common and it wasn't uncommon to use heavier weights when the blue cloud out the back stopped traffic.

I know I can randomly ask 100 people about why they use a particular brand and their rationale will be based on nothing other than it was recommended by someone they think should know or they have had good experiences with the brand.

There are studies that rate the brands. Some are more credible than others but since there are many different winners in the various tests it is easy to use a study to validate our brand choices.

Most of us have a brand we swear by. The reality is that there are many brands that meet MFG. specs so most of us have made a valid reason to believe in that brand.

I think the oil and filter change interval is the secret to how the inside of the engine looks after 100,000 miles and I would be extremely skeptical of anyone saying an engine problem was because I was using the wrong in spec oil.
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  #48  
Old 12-08-2015, 12:53 PM
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  #49  
Old 12-08-2015, 03:15 PM
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Quote:
Originally Posted by bcredliner View Post

I think the oil and filter change interval is the secret to how the inside of the engine looks after 100,000 miles and I would be extremely skeptical of anyone saying an engine problem was because I was using the wrong in spec oil.

Ditto. I think this settles. I totally agree whit the statement above.
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  #50  
Old 12-08-2015, 04:37 PM
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Mine looked like TiAgX5's picture with my VCG replacement at 245,000 miles. I've stuck with the OEM oil & filter since the dealer's been generous with their customer loyalty discount and I haven't had any performance issues.

Now at almost 292,000 miles I am experiencing a little more oil consumption during city driving - about 1 quart per 1000 - but see no blue cloud evidence of loss via valve stems, so I'm thinking it's time to service the CCV system.

2002 X5 3.0 291,800 miles
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2001 325i sold at 66,000 miles
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