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Engine + Driveline / Re: which oil you would recommend?
« on: May 10, 2015, 10:02:37 AM »
I live in Mesa, Arizona. It hardly freezes here....
QuoteI think 15W is not a good idea because it is too thick when cold causing more wear during cold startup. try using a 0W.
I think it depends on how and when you run your car. I personally I don't DD my E30, I only really drive it during the summer months. So 15w-40 oil works for me. At 15 degree Celsius the Kinematic viscosity of 15w-40 is 459.60 mm˛/s, at 0-1 degree Celsius 5w-30 & 0w-30 are around the same viscosity. Now If I were to run my car during the winter months, I'd definitely switch to a 0w or 5w.
Here are some charts and graphs I made a couple years ago relating to oil viscosity. Not the greatest charts around but they do the trick. If anyone's interested I can send you the excel file.




