Originally Posted By: UltrafanUK
Originally Posted By: CATERHAM
Originally Posted By: CT8
There is no reason to run a XW-20 unless in the sub Arctic.
The main reason to run an engine spec'd for a 0W-20 or 5W-20 grade is because that's what the engineers have designed the engine to use.
The reason I use a 0W-20 in my track car is because my oil temp's don't get high enough warrant using anything heavier. It really is that straightforward.
Most engines are not designed to use a particular oil grade, they often decide on the oil grade after a long series of bench tests, then err on the lighter side for cars sold in the US due to the CAFE regs game.
I would posit that the vehicles that come offering manuals with a range of viscosities for a range of temperatures and operating conditions indicates more of the designers intent and understanding of his engine's needs than a blanket "one size fits all" in the US.
Honda's own R and D papers show that the US market has a probabilisticly more narrow range of operating points than some other markets...one size fits all is likely less potentially problematic in those those markets.
Originally Posted By: CATERHAM
Originally Posted By: CT8
There is no reason to run a XW-20 unless in the sub Arctic.
The main reason to run an engine spec'd for a 0W-20 or 5W-20 grade is because that's what the engineers have designed the engine to use.
The reason I use a 0W-20 in my track car is because my oil temp's don't get high enough warrant using anything heavier. It really is that straightforward.
Most engines are not designed to use a particular oil grade, they often decide on the oil grade after a long series of bench tests, then err on the lighter side for cars sold in the US due to the CAFE regs game.
I would posit that the vehicles that come offering manuals with a range of viscosities for a range of temperatures and operating conditions indicates more of the designers intent and understanding of his engine's needs than a blanket "one size fits all" in the US.
Honda's own R and D papers show that the US market has a probabilisticly more narrow range of operating points than some other markets...one size fits all is likely less potentially problematic in those those markets.
