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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Apr-14-2018, 07:29:50 PM   #1
Daily Driver
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Default Impact of Excess Gas on Blackstone Report

I have a new-to-me 2003 M3 Coupe (6spd) with 115,000 miles. The rod bearings were changed under the factory recall at 19,000 miles. Apart from that, I have no records of prior service. I bought the car on a leap of faith as it was by far the tightest I drove in a 2 year search and drove better than cars with half the mileage.

In the last 2 or 3 months, the gas mileage has been dropping off. I blamed this on the winter gas up here in the PNW. However, a couple of weeks ago, the car suddenly went to limp mode and then quit. It was an injector stuck open and dumping gas into the cylinder. No damage to the engine, but I expect that the one cylinder had been dumping too much fuel for 2 or 3 months leading to the poor gas mileage (it is back to normal now that the injector is replaced). The Blackstone report (attached) shows there was excess fuel in the sample (mine = 3.3% vs <2.0 std). In doing a 'search', Blackstone indicates that too much fuel in the oil can lead to high wear/metal indicators. This seems logical as the oil would be 'thinned', as indicated my Blackstone report.

I am concerned about my high lead reading (22 vs 5 std) and mildly high copper (13 vs 8 std) readings. Is it possible that both these readings are high due to excess fuel in the oil for 2 to 3 months? If not, how soon do I need to change these rod bearings?
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File Type: jpg 2018 Apr 8 Blackstone BMW Redacted_jpeg2.jpg (132.2 KB, 45 views)

Last edited by Daily Driver; Sun, Apr-15-2018 at 12:10:55 AM.
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Old Sat, Apr-14-2018, 08:27:27 PM   #2
Drewster
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Default Re: Impact of Excess Gas on Blackstone Report

Fuel doesn't spawn copper or lead. If those are high, you should plan to do rod bearings.
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Old Sun, Apr-15-2018, 03:34:24 AM   #3
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Default Re: Impact of Excess Gas on Blackstone Report

^ He's right, lead and copper indicate possible rod bearing issues. I would wait until the next oil change, and get another Blackstone report. If the lead and copper values are still high, plan on getting rod bearings done before they fail.
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Old Sun, Apr-15-2018, 05:17:56 AM   #4
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Default Re: Impact of Excess Gas on Blackstone Report

You can wait to the next change to confirm, but copper at this level especially means you're through the lead, time for rod bearings.

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Discussing Impact of Excess Gas on Blackstone Report in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)