Adding to the dilemma is that thinner oils run cooler, and thus thin less .
Different take on "thin v. thick" discussion
- Thread starter AlienBug
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I don't know how much cooler the xW20 does compares with M1 0W40 (I don't have oil temp gauge), but the coolant seems to be about 4-6C lower at highway speed.
I trialled the thin stuff (25W70) but got scared and went back to 40W70.
Originally Posted By: sprintman
I trialled the thin stuff (25W70) but got scared and went back to 40W70.
I trialled the thin stuff (25W70) but got scared and went back to 40W70.
Well..BMW's previous F1 team ran a 20w oil.
i agree with the theory proposed by the alien. due to the way i drive (very lightly), i feel it is fine to run a lighter grade - such as mixing equal parts 5w20 and 5w30. due to the lighter viscosity of the final oil, it resists shearing better and stays in grade. especially in colder times of year, i feel this is a good plan. in the heat of summer, and sometimes doing prolonged 80 mph runs, the hot parts of the engine get hotter, and also if using a turbocharger, in cases like this i will mix 10w30 and 5w30. if the vehicle is mainly used around town and run lightly, then there is never any need for a heavier oil like 10w30.
Originally Posted By: BMWTurboDzl
Well..BMW's previous F1 team ran a 20w oil.
Yeah but those aren't the same as street engines and they cost over $100,000 each so I'm sure they can engineer it to run on cooking oil if they wanted to.
Well..BMW's previous F1 team ran a 20w oil.
Yeah but those aren't the same as street engines and they cost over $100,000 each so I'm sure they can engineer it to run on cooking oil if they wanted to.
Originally Posted By: Captain_Klink
i agree with the theory proposed by the alien. due to the way i drive (very lightly), i feel it is fine to run a lighter grade - such as mixing equal parts 5w20 and 5w30. due to the lighter viscosity of the final oil, it resists shearing better and stays in grade. especially in colder times of year, i feel this is a good plan. in the heat of summer, and sometimes doing prolonged 80 mph runs, the hot parts of the engine get hotter, and also if using a turbocharger, in cases like this i will mix 10w30 and 5w30. if the vehicle is mainly used around town and run lightly, then there is never any need for a heavier oil like 10w30.
I actually don't like to talk about oil grades in general terms since it borders on meaningless since there is so much overlapping variance in operational viscosity (HTHS vis) between the multitude of oils available.
It makes so much more sense to say I'm running a 2.6 cP 20wt vs a light 3.0 cP 30wt or a heavy 3.5 cP 30wt or anything in between. Now we know what's we're talking about!
i agree with the theory proposed by the alien. due to the way i drive (very lightly), i feel it is fine to run a lighter grade - such as mixing equal parts 5w20 and 5w30. due to the lighter viscosity of the final oil, it resists shearing better and stays in grade. especially in colder times of year, i feel this is a good plan. in the heat of summer, and sometimes doing prolonged 80 mph runs, the hot parts of the engine get hotter, and also if using a turbocharger, in cases like this i will mix 10w30 and 5w30. if the vehicle is mainly used around town and run lightly, then there is never any need for a heavier oil like 10w30.
I actually don't like to talk about oil grades in general terms since it borders on meaningless since there is so much overlapping variance in operational viscosity (HTHS vis) between the multitude of oils available.
It makes so much more sense to say I'm running a 2.6 cP 20wt vs a light 3.0 cP 30wt or a heavy 3.5 cP 30wt or anything in between. Now we know what's we're talking about!
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