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I just drained the ATF for the 4th time and the fluid is still dirty. Cleaner than the last time, but still significantly darker than the new red stuff. (Using Valvoline Maxlife Synthetic.) Is this normal for this trans? The car has 125k miles on it, and this is probably the first time the ATF...

https://thegumptiontrap.com/2016/11/07/bmw-m54-oil-filter-comparison/

Over the years I've replaced many o2 sensors in many cars. Often I'll replace the upstream sensors around the 100k-150k mile range as a maintenance item. The upstream replacement--typically done around the time of other items such as trans flush, ECT replacement, filters, spark plugs, etc--often...

I just bought this car. It has 110k miles on it. It's currently in with an independent mechanic getting the timing belt and water pump etc done. (I wish I could have done it--I just don't have the time or tools/space at the moment.) I need recommendations for oil--20k miles per year...

I'm looking for a good year round oil that can do ~10k miles. I don't care about the price--just whatever can handle those miles the best. Mostly highway driving, no short trips. Northeastern climate, so something that can handle cold starts below freezing. ~20k miles per year. The engine...

I'm changing the oil in my sister's car, and it was on sale at Walmart. Any reason not to use this oil in this car? She's likely to leave it in there for quite a long time, probably 10k+ miles, so I wanted something that could handle it.

The other day I watched the last of the "Ultimate Factories" DVDs I took out from the library. They were all tours--with an extremely obnoxious narrator--of automotive factories. I was surprised, most of all, to see that Bentley, Rolls Royce, and Lamborghini are actually expensive to produce and...

My BMW E46, with GM transmission, currently has mostly Redline D4 in it. I dropped the pan, changed the filter, and refilled it roughly a year ago. A month after, I drained and filled again with more redline D4. The D4 is supposed to be closer in viscosity to Dexron III compared to Dexron VI...

It's a 2.5 liter, M54 motor in a BMW E46. It had been using about a quart per 1000 miles--which is okay according to BMW --and is using much less after I modified the PCV system. After 1200 miles, the dipstick has gone down 1/4. I'm currently using M1 HM 10w40, which wasn't having any effect...

I've been using this oil to help with consumption, and recently did an oil change and used it. Is it okay to leave a 10w oil in the car over winter? It's gone to -10f a few times here in NJ. Usually, it's coldest from January to early March. Should I change it out around December, regardless of...

I've decided to an engine air filter change interval of 15k instead of 30k, and to swap out cabin filter at the same interval. Someone posted this filter on another forum I'm on...

I just mentioned how Auto-RX didn't do anything for an old car I had in a different thread, and I started wondering whether or not there's proof of anything cleaning a sludged engine. I've had a [censored] of a time finding any proof for the common claim that HDEOs and synthetics will clean...

Is anyone using this filter in their BMW? I've been looking around to see if there's anything superior to the OEM BMW filters--MANN, Mahle, Hengst--and this one seems like it is. It's identical to the NAPA Platinum (these are made by Wix, right?) filter, but it's cheaper. The NAPA Platinum is...

I'm a new member and, even though I've been reading these forums for the past decade, I've been spending a lot of time on here since I joined. This is probably the sort of question that will cause an uproar, but I'm wondering why certain brands are perceived in a certain way, and if my...

I had a lot of trouble trying to figure out where to post this, but decided to put it here based on the idea that anyone reading this section is at least interested in fuel additives and might have an opinion on this. First off, this isn't my idea. I came across it while researching piston...

I'm planning to use this stuff to do a piston soak on my BMW M54 motor. It's burning just under 1 quart per 1k miles, currently. Any opinions on this stuff, good or bad? Any recommendations for a different product? Thanks!

This is my first post here, so I hope I haven't put this in the wrong place. I've read every post I can find about this additive on BITOG, and I'm just wondering overall what people's opinions are of this additive in the German inline six motors. I'm planning to put it in a BMW M54 motor. Thanks!