I can get it for $8.95/L from online website but then have to pay shipping, so I'll pay a little more to get it locally.

Maybe if someone knows where I can order a bunch of it, I'd do that too.

RS6 has some crazy ass oil requirement as well.

They require this specific oil in the M3 and no other. Lotus recommends Castrol RS 10w-60 for the Elise for "more advanced driving' but the TWS is a step about the RS.

The BMW oil changes come at 15k intervals roughly, depending on driving, some have seen the indicator come on at 10k, hell if I'm waiting that long though.

I've always managed to find it for roughly the same price at most dealers in FL with a club discount.

If the manufacturer recommends it, that is what I am going to do.

I've been wanting to try this -

Run car with same oil for 3k miles. Drain and save sample.

Run car in same envirionment w/ same oil for 10k miles.

Then, send oil off for analysis (complete breakdown, that also shows its life-term viscosity and impurities).

FYI - My 944 died due to oil starvation, not the lack of an oil change.

Hows DC...or whereever the hell you are?

Equations are run against things like speed, how long at a given speed, oil temp, external temperatures, air fuel ratios, etc. and an inerval for an oil change is constantly calculated . Every time you start up it gives you a figure. 15k is what the manufacturer says the average driver can go to, but that also assumes perfect exterior conditions as well.

3-5k changes on synth is probably not necessary for your daily driving, but 15k, that's starting to push the limits of synthetics oils in my book. I'd say 10k is a good safe number for manuf's to tell people and set their clocks at.
But on the M3, where there have been 3 different bearing changings, I'm not going to try my luck, so I'll do my chage at 7-8k and the dealer will change it the next 7-8k, rinse and repeat.

Heck, the Hondas don't have dipsticks anymore....it will tell you when your oil is low. That just seems wierd.