Originally Posted By: Quattro Pete
Originally Posted By: HTSS_TR
Originally Posted By: Quattro Pete
Originally Posted By: HTSS_TR
But, depend on how easy the car is driven, thinner oil such as M1 xW30 may be used. Most of the time the engines in America don't see more than 3000 RPM, except few who track their cars.
If you bought a BMW with their legendary inline-6 engine and don't regularly take it above 3K rpm in daily driving, you are missing out.
But yeah, there are days when I don't go above 3K rpm, mainly because of short distances where I don't want to wring out an engine that's not fully up to temp.
The problem with So Cal is we don't have room to go faster than 75-80 MPH 20 hours a day, only between midnight and 4 AM you can go faster than 85-90 MPH, but you may get speeding ticket for going more than 20 MPH over the speed limit of 65 MPH. What is engine speed at around 80-85 MPH ? around 2500-3000 RPM ?
Im not talking about maintaining 3k+ rpm for extended periods. Im talking about going way past 3k while accelerating in lower gears.
Btw, in my car, 3k rpm is at 75 mph in top gear. Speed limit is 70, and most people drive at 80.
I said "Most of the time", I mean more than 90-95% of the driving period the time most people spend on acceleration is way less than 3-5%.
For hard acceleration my E430 can see 4-5k RPM easily, but it was in that RPM for less than 10-15 seconds. During this hard acceleration the oil temp may increases 5-10F at most, then it will come down to normal operating within a mile or two.
Based on this assumption I use thinner oil than M1 0W40 in my E430.
The S2000 sees 4k+ RPM more than 80-90% of my driving, I use slightly thicker(higher HTHS) than xW30 oil.
Originally Posted By: HTSS_TR
Originally Posted By: Quattro Pete
Originally Posted By: HTSS_TR
But, depend on how easy the car is driven, thinner oil such as M1 xW30 may be used. Most of the time the engines in America don't see more than 3000 RPM, except few who track their cars.
If you bought a BMW with their legendary inline-6 engine and don't regularly take it above 3K rpm in daily driving, you are missing out.
But yeah, there are days when I don't go above 3K rpm, mainly because of short distances where I don't want to wring out an engine that's not fully up to temp.
The problem with So Cal is we don't have room to go faster than 75-80 MPH 20 hours a day, only between midnight and 4 AM you can go faster than 85-90 MPH, but you may get speeding ticket for going more than 20 MPH over the speed limit of 65 MPH. What is engine speed at around 80-85 MPH ? around 2500-3000 RPM ?
Im not talking about maintaining 3k+ rpm for extended periods. Im talking about going way past 3k while accelerating in lower gears.
Btw, in my car, 3k rpm is at 75 mph in top gear. Speed limit is 70, and most people drive at 80.
I said "Most of the time", I mean more than 90-95% of the driving period the time most people spend on acceleration is way less than 3-5%.
For hard acceleration my E430 can see 4-5k RPM easily, but it was in that RPM for less than 10-15 seconds. During this hard acceleration the oil temp may increases 5-10F at most, then it will come down to normal operating within a mile or two.
Based on this assumption I use thinner oil than M1 0W40 in my E430.
The S2000 sees 4k+ RPM more than 80-90% of my driving, I use slightly thicker(higher HTHS) than xW30 oil.
