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Do NOT use 15-50, 36mm socket, not 45, right? (archive)

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Posted by PerryinVA on March 02, 2001 at 13:47:54:

In Reply to: Oil Change Help posted by J on March 02, 2001 at 12:28:08:

I'm pretty sure its a 36mm socket not a 45mm, but I don't have it here with me. I just changed my oil on my 99 2.3 2 weeks ago. I would use the BMW synthetic which is 5w-30, made by Castrol, according to sources and the dealer. With a BMWCCA discount card it is $2.88 a quart (3.60 without, at my BMW dealer), by far the cheapest 100% synthetic I have found. Do NOT use 15-50, you are only reducing your gas mileage, making it harder to start, and increasing parasitic load; ie reducing your available horsepower & torque. You will also be increasing wear until your oil is up to temperature. Unless you track your car, and I don't mean autocross, 15-50 is for cars that leak oil, race, or spend their life in Death Valley or the Sahara. It is a common misconception that higher viscosity offers better protection, but any tribological engineer will tell you that the 2 are not related. The bearing surfaces require a specific designed shear layer of oil, and oil that is too viscous will not provide an adequate layer. In addition, the less viscous the oil, the better the flow properties hence better cooling, and less pumping power required.

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