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I'm curious, has anyone ever scientifically tested the flow difference on a used oil filter as compared to a new oil filter, to see how much flow is actually affected after 5k or 10k miles? I've read so many threads about guys complaining about "bad" oil filters but have never seen any testing...

I posted a question a while back concerning the new BMW front & rear differential fluids weights. Front Differential with a G2 fluid, which is a GL5 75W85 @ $59.49/ .5 liter Rear Differential with a G3 fluid, which is a GL5 70W80 @ $80.49/ .5 liter Both take a little over .5 liter, so I would...

I hope that some of you gear heads can maybe explain to me the REAL reason for BMW's Front & Rear Differential GL5 viscosity fluid change. I own & maintain 5 current BMW's of different years & models (92 E34 535i, 01 E39 540i, 05 E46 330ic, 07 E83 X3 & newest 15 F15 X5. It's time to drain &...

Guys, I currently have a '17 Silverado with the 6L80 6 speed transmission. I'd like to do a "Drain & Fill" & was wondering if I can use the is Mobil 1™ Synthetic LV ATF HP Fluid instead of the Dexron VI. Will this fluid mix OK & not Cause any issues? Truck has about 39k on it now & I would do a...

Good morning guys. As the title say, I'm wondering if any of you can tell me how long it take for additives & particulate matter to fall out of or settle/separate in oils. Here's the back ground. I use Pennzoil oil in just about all my vehicles, mostly BMW's but also have a Silverado. I was...

I need your help understanding what I see in the bottom of the "pure" Ultra Platinum Pennzoil oil. After changing the oil in our '15 BMW X5, I noticed some "dark" stuff in the bottom of the 5 qt jug. What is thins stuff? I thought that this was suppose to be the Purest motor oil since it's made...

I recently purchased a 2018 John Deere E120 V-Twin 20HP (Briggs & Straton) 42" lawn mover. Looking at doing some maintenance on it, I started looking at the "JD 30 sec oil change" that is installed on it & did some research. It appears that this new "oil change system" comes with filter & oil in...

Can anyone give me some insight on this subject. I'm just curious. I have always be taught to change the filter at every oil changes. But why? With todays engines & better oils, several car mfg. Have increased oil changes at 12,000 to 15,000 miles. Not saying this is a good thing, but never the...