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Originally Posted By: wannafbody In other words, the government wants engines to wear out so you have to buy a new car so you can keep the economy moving. And as GDP continues to grow, your congressman can brag about the jobs he's created and get reelected. Well, it's less bad than that. The...

http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Racing_Oils.aspx It seems these are "fully-additived" like a street oil but with as much ZDDP as would benefit the motor, not considering the cats or such. If the offered viscosities (and price!) seem right for you, this might be a good...

If there is a lot of blow-by at the rings, oil can be significantly diluted by unburnt gasoline. Other than that, being a layman, it sounds plausible that shear in the oil (working it through the motor against the forces of it's own viscosity) might break it down. However, especially with...

I've seen several times at drive-in oil change places where you sit in your car, where at the end, the guy will come to your window to show you the dipstick is at the full mark to prove they filled you up, but will follow this procedure right in front of you: 1 - remove and wipe off dipstick 2...

Thanks for the chat guys! This was a hypothetical, but an interesting one to me, and it was good to be schooled that it'd devolve to constant 4000-mile oil.

Cool! thanks for the math! So if the oil is one of those 7.5k or 15k extended service oils, we're, well, OK. (And I appreciate that we agree that the oil is continuously mixed). I assume all contaminants are and sludge precursors burnt along with the oil, in the percentages they exist. I don't...

Originally Posted By: OVERK1LL Originally Posted By: scoobie no, it doesn't work that way, because the oil u put in 4000 miles ago is still mainly there, and worn out. keep doing what you suggest and you're in for an engine rebuild, i would say, in about 30,000 miles, if you're lucky. Are you...

Yes, UOA would be prudent when filters were changed.

Originally Posted By: scoobie no, it doesn't work that way, because the oil u put in 4000 miles ago is still mainly there, and worn out. keep doing what you suggest and you're in for an engine rebuild, i would say, in about 30,000 miles, if you're lucky. How do you say so? If the motor burns 1...

Originally Posted By: BuickGN Originally Posted By: JoeWeinstein No, let's say I'm running the correct viscosity for my motor... No one should run thicker, just to stop consumption. That's like turning your blood to jelly, to stop a hangnail from bleeding. I'm surprised my TL is still running...

Yes, let's assume that the oil lost is not leaked externally, but burnt, due to some combination of ring, valve, and other wear. Let us also assume that the oil consumption doesn't cause any other problem, and the wear or tolerances that allow the oil loss are not getting any worse. For those...

I'm adding 1 qt per 1000 miles (1/2 qt every 500) so total replacement every 5000 miles. So my oil is always about 2500 miles old, as a mix.

No, let's say I'm running the correct viscosity for my motor... No one should run thicker, just to stop consumption. That's like turning your blood to jelly, to stop a hangnail from bleeding.

Hi all. I know this smells funny, but tell me where. If I have a car that has a 5-qt oil capacity, and burns 1 qt/1000 miles, and I keep it topped off, adding a 1/2 qt every 500 miles, I'm already essentially changing the oil every 5000 miles, right? If I use a high-enough quality oil for a...