[marc x]

28i xdrive prod date:11/11
original water pump btw.
job cost me $400 @ indy in Huntington Beach area

before job I would get a ton of shuddering when engine warms. I still have to do some more driving to see if that remedied it but I was expecting the shudder to be from the transfer case, which has seen its fluid change and reset @ 175k miles. When the mechanic checked the worm gear of the transfer case during the atf, for possible repair, he said it looks fine.

Also during the mornings from a cold start, my trans would whine and I am sure it is because the fluid was low because I pulled the check plug without the car being in neutral and lost some fluid. I looked at the pan but didn't take pics or keep it. The magnets had a fair share of metal shavings and the fluid looked darker. Since I didn't have a pair of gloves on, I didn't rub the fluid between my fingers to check the viscosity but I dipped a piece of white paper into it and can see that the fluid had discoloration throughout!

So far my shifting has become smoother but I still get a slight kickdown but I plan to reset the adaptations using ISTA and maybe that will clear that up. And so far no shudder but I have only put about 75 miles on but so far so good.
btw- the shuddering would occur when the trans was in between shifting, and it stopped or didn't occur in between shifting if I was in Sports mode [shift stick over left].

I am happy I do not have the problems that come from those turbos since my motor is the last I6 na. But I do have the engine tick at cold starts and so far BMW NA doesn't want to cover me and the problem has a 10 year unlimited mileage warranty so I will be contacting DOT or someone for some help! Other than that, this car is ridiculously reliable, because I have been racing through mountains and even been off roading and in deep snow! Only component I lost was a wheel bearing but it didn't leave me stranding, just would sound like you have a flat tire when you're driving.

Its almost time for my 10k oil change so I would like this time to send some oil in for testing.

[marc x]

The shop used TopTec 1800 ATF

[Bimar]

191k Miles, damn! I presume it’s the N20 engine.

[BIG_KID]

11/11 should still have the N52 I6 naturally aspirated engine

[marc x]

Ugh I still have shudder!! I read a post saying t could be the front wheel axlesa

It is the straight 6.

And the engine light is telling me to replace my cats, the book says a five hour job, so I will do half and pay an Indy to the the other half, since you have to remove the engine from the motor mount to get one of the manifolds w/ cats replaced. The parts are being delivered in a few hours.

[malicem3]

Originally Posted by X4guy

191k Miles, damn! I presume it’s the N20 engine.

Not gonna see very many N20's at 191k that haven't had a major failure (i.e. timing chain). I6's on the other hand... especially the N52 are the best.

[marc x]

Did the oil change and have the results of the oil analysis;

Even though I thought I topped off with 0/40, it was 0-30 from the dealer that was used, I confused it with another car. So this has seen all 0-30 dealer oil for this interval.

[epiphone3]

Is this the first time you've done the ATF and filter change on this transmission?

[marc x]

Yes it is the first time

[marc x]

replaced transmission with one with about 70k miles on it; and I re-used my valve body!
X3 drives like new again and the shudder is 100% gone now!!

[Wgosma]

Originally Posted by marc x

Ugh I still have shudder!! I read a post saying t could be the front wheel axlesa

It is the straight 6.

And the engine light is telling me to replace my cats, the book says a five hour job, so I will do half and pay an Indy to the the other half, since you have to remove the engine from the motor mount to get one of the manifolds w/ cats replaced. The parts are being delivered in a few hours.

Did you in fact replace the CATS?

At what mileage did you replace Oxygen sensors?

Thanks/Bill

FYI...Oil analysis - (I have same motor) at 75K mile mark: (I had shop change my tranny fluid/pan/filter at time this motor oil analysis was run.

[marc x]

cats and o2 @ 189k;; my last BMW cats lasted same mileage and I put two engines in that before getting rid of it.

[Wgosma]

Originally Posted by marc x

cats and o2 @ 189k;; my last BMW cats lasted same mileage and I put two engines in that before getting rid of it.

Thanks. The CATS I think should have given longer life. O2 sensors did quite well however!