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Anyone assuming SAs are stupid don't understand the business. They (SAs) deal with hundreds of customers a week. Out of 100 customers they maybe get one that hangs out at forums and reads up on all the DIYs and assumes they know more than the SAs. Unless they know you PERSONALLY they're going to simply assume you are just like the 99 other customers who doesn't know anything about cars. So they tailor their spiel to keep their jobs as simple as possible. Trying to explain to anyone that BMW engines require specific API and ILSAC ratings AND BMW's own LL-01 or better spec of a specific viscosity is useless. So they just tell you you can't use anything else or you shouldn't mix it because, well, to explain further would just be a waste of time, only confuse the customer more, and making more work in general for them.
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Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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