WDEagle wrote:

WDEagle wrote:

We run Mobile 1 10w30 year round in our      with changes every 5K miles.  We are now just shy of 160,000 miles

Update: I check the oil level on the  "religiously" every Sunday.   I may have added oil (outside of regular changes) once or twice in 8 years.  Our car just doesn't use oil.

Thanks man. I'm hoping I get to 160K with no major problems.

Side Note/Horror Story: My girlfriend drives a 2008 Mazda CX-7 and after a little research I discover that her car is a bit more interesting than I initially thought as it shares the same motor as the MazdaSpeed 3 with only a slightly different turbo. It makes a respectable 258 ft. lbs/ 244 hp w/ AWD and a 6-speed shiftable automatic. She grew up inadvertently being taught to stay hands-off with her car and was very hesitant to let me touch it in anyway for a long time until recently when she saw her oil light flashing on and off. I took her to Autozone to buy some oil and a new oil filter for her car to do an oil change. I find out that it requires a special oil filter wrench to remove the oil filter (paper type) without damaging it. While doing this I notice that I can't get an oil reading on the dipstick. I add almost 4 liters of a 5.1L jug of oil before it ever registers as low on the dipstick. 

I tried to stress to her how  important it was to keep the proper amount of oil (or at least some) in a turbo charged car. Her reply of course was "my car has a turbo, what is that?".....

Last edited by BlkSaabaru4Me (2013-06-24 15:34:56)

  I don't use any oil at Autocrosses.   HPDEs will use oil, but high RPM use is much more sustained there.

I don't like the idea of oil additives. You're taking the extensive research of the oil manufacturer and throwing it all out the window. I can guarantee you whatever oil you use has been engineered for a balance of lubrication, wear protection, resistance to shearing forces, and a hundred other factors. They adjust all the compounds in the oil to optimize all the factors. Adding more molybdenum and who-knows-what-else to this already-optimized motor oil isn't going to improve it's performance.

If you have a high-performance engine, use a high-performance motor oil. If you have a high mileage engine, use a high mileage oil. On the rare chance you have something really unique, like a Model T, you could be justified in using oil additives, but I would still run off-the-shelf oil of the correct viscosity.

That's my opinion; you're free to do whatever you want.

Cobalt905 wrote:

I don't like the idea of oil additives. You're taking the extensive research of the oil manufacturer and throwing it all out the window. I can guarantee you whatever oil you use has been engineered for a balance of lubrication, wear protection, resistance to shearing forces, and a hundred other factors. They adjust all the compounds in the oil to optimize all the factors. Adding more molybdenum and who-knows-what-else to this already-optimized motor oil isn't going to improve it's performance.

If you have a high-performance engine, use a high-performance motor oil. If you have a high mileage engine, use a high mileage oil. On the rare chance you have something really unique, like a Model T, you could be justified in using oil additives, but I would still run off-the-shelf oil of the correct viscosity.

That's my opinion; you're free to do whatever you want.

That was my stand too. I thought additives were a waste of $.
But for the past couple of oil changes I've used the MoS2 and the engine runs noticeably smoother than before.  I've been using German Castrol after the first two dino oil changes.
I don't think adding half a can of MoS2 every other oil change will hurt anything, and at the very least you may get a smoother running engine after a few hundred miles, and in the long run it may save you $.

In a perfectly "already-optimized" world you are right.
But this is not the case with most drivers and their engines, as has been shown with countless UOA results.
If you trade-in the car every 3-5 years, or even 7 years, using German Castrol or MoS2 is pointless for you and a waste of $.  If you've been using them it'll be of benefit to the next owner.
Starting to use high mileage oil when the engine reaches high mileage is foolish, in my humble opinion.  It falls in the "too little, too late" category.  If you plan on keeping a car to a high mileage point and beyond you've got to start taking care of things early.
If you plan on keeping the car 10 years or more and put 15K-20K per year then using the above will help.