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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 Wed, Feb-13-2019, 02:27:03 PM   #1
Dirty Elf
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Default How long do tranny fluid and fuel injectors last?

I was cleaning out the garage and found an open jug of tranny fluid and the injectors I had rebuilt a few years back.

Is the tranny fluid hygroscopic like brake fluid or should it be ok?

Anything I should do to the injectors? I looked for MEPH to retest them but it seems that is no more.

The tranny fluid isn't really a problem, I can just grab another jug. Really wondering what to do with the injectors. Is there a service that will check them and rebuild if needed?


In case someone is searching for this in the future I guess it would be prudent to post the service interval for the tranny fluid and fuel injectors as well.

The tranny fluid says "lifetime fluid" but depending on your definition of lifetime, or what lifetime they are referring to, at some point it will need to be changed. I'm at 150k and think I'm probably past due. I'd say this probably should be on the 100k interval.

Not quite sure about the injectors. At 150k I think I'm wayyy past due. They probably should be serviced at 75k intervals? 50k? Open to opinions.
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Old Wed, Feb-13-2019, 02:37:39 PM   #2
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Default How long do tranny fluid and fuel injectors last?

Depends. Were the injectors in a sealed bag? Then Id think they should be good.

I would think normal operating temps would get rid of any moisture that got into the tranny fluid.

The deal with brake fluid is that it is a closed ended system. Moisture will boil and can create air pockets which will likely not work its way back to the reservoir. Air will remain near the caliper causing the spongy feel. When the fluid cools moisture turns back into a liquid.


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Old Wed, Feb-13-2019, 05:22:01 PM   #3
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Default Re: How long do tranny fluid and fuel injectors last?

Injectorrx.com did mine recently, I think the turnaround is usually 24-48hrs
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Old Wed, Feb-13-2019, 05:28:28 PM   #4
TboneM3
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Default Re: How long do tranny fluid and fuel injectors last?

There's RC engineering in socal too.

I think you're fine to use both as is. Was the fluid sealed with a cap?

The fluid doesn't go bad just sitting in the tranny.
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Old Wed, Feb-13-2019, 05:30:55 PM   #5
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Default Re: How long do tranny fluid and fuel injectors last?

I just had Mr. Injector clean the injectors on my wagon's S54.

Quote:
Originally Posted by Dirty Elf View Post
The tranny fluid says "lifetime fluid" but depending on your definition of lifetime, or what lifetime they are referring to, at some point it will need to be changed. I'm at 150k and think I'm probably past due. I'd say this probably should be on the 100k interval.
BMW originally said "lifetime", then they defined "lifetime" to mean 100,000 miles, then they decided the e46 m3 trans fluid wasn't "lifetime" and is an inspection 2 item (40-60,000 miles, depending on usage.

I do it every inspection 1 and inspection 2.

You're way past due, even per BMW's last suggestions.
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Old Wed, Feb-13-2019, 06:31:14 PM   #6
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Default Re: How long do tranny fluid and fuel injectors last?

Injectos start failing at 160-180 K miles.
They get gummed up by 80k.id say they're nearing their end of service life
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Discussing How long do tranny fluid and fuel injectors last? 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)