7 Speed Auto Trans Fluid Change

Tractionless · 01-09-2020, 03:42 PM

Quote:

Originally Posted by nis350

thanks for the write-up.

Have a question about fluid level.

Does it make a difference on the fluid level check with the engine running or not (in Park or Neutral)?

Has anyone heard of Liqui Moly Top Tec 1800 ATF or Eneos? I was told that both are good ATF (Matic-S) with Liqui being better (full synthetic).

Engine running and in park or neutral is fine.

Have you confirmed beyond word of mouth they are Matic-S compliant?

nis350 · 01-10-2020, 01:39 AM

Thanks for the info.

Yes, Matic-S is listed for both ATF. Heard the Liqui Moly is really good and it is very popular among European cars. I've used their motor oil for my M3 before. I did some research and found that many European cars use Japanese transmissions.

Quote:

Originally Posted by Tractionless

Engine running and in park or neutral is fine.

Have you confirmed beyond word of mouth they are Matic-S compliant?

jchammond · 01-10-2020, 04:32 AM

Quote:

Originally Posted by nis350

Thanks for the info.

Yes, Matic-S is listed for both ATF. Heard the Liqui Moly is really good and it is very popular among European cars. I've used their motor oil for my M3 before. I did some research and found that many European cars use Japanese transmissions.

If you’re using a different fluid than oem; I’d recommend to flush & ensure that you end up with what you switch over too

Wouldn’t trust mixing fluids in this pricey trans

nis350 · 01-11-2020, 01:14 AM

good suggestion. Thanks.

According to the fluid manufactures, it is fine to mix the 'matic-s compatible' fluid. I was told not to flush a high mileage transmission.

Quote:

Originally Posted by jchammond

If you’re using a different fluid than oem; I’d recommend to flush & ensure that you end up with what you switch over too

Wouldn’t trust mixing fluids in this pricey trans

jchammond · 01-11-2020, 02:50 AM

Quote:

Originally Posted by nis350

good suggestion. Thanks.

According to the fluid manufactures, it is fine to mix the 'matic-s compatible' fluid. I was told not to flush a high mileage transmission.

Unsure who told you that; as it’s a hydraulic system & the fluid does break down...Some forum members remove the pan/clean while doing this process.
I’m not speaking of putting any kinda solution/cleaning stuff through it- just drain,fill,operate & repeat until fluid is nice & clean.
I’ve also heard the magnets in the pan will get pretty heavily covered.
It’s all about “PM” (preventive maintenance) & not thinking about having to purchase a $9,000.00 tranny

Or gamble on a re-Tran

nis350 · 01-11-2020, 02:17 PM

I was told not to flush high mileage trans by the dealers as well as independent technicians. I personally would not know either way, but decided just to do the drain/fill to be safe.

Saw your 'DIY' and thought that was great.

Quote:

Originally Posted by jchammond

Unsure who told you that; as it’s a hydraulic system & the fluid does break down..

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