Gentlemen:
Two questions:
I have been looking at data sheets for Amsoil and Mobil 1 in various weights. For the most part it seems like Amsoil is slightly "thicker" comparing viscosity at 40°C and 100°C between comparably labeled oils. Does this mean that an oil with higher numbers at certain measured temperatures provides a better (better being more protection) film between moving parts?
The manual to my car states that I may use either a 5W-30 or 5W-40 synthetic oil. Summer is on its way, and my car is due for another oil change. I have used M1 0W-40 before, but my mileage was consistently 1.5-2 MPG less than with M1 5W-30. Looking at Amsoil 10W-30 and using its viscosity at 40°C and 100°C, it seems to bridge the gap between Mobil 1 5W-30 and Mobil 1 0W-40. Gasoline is getting rather expensive here ($2.53/gallon for 91 octane today) so mileage is important to me, but so is the longevity of my car!. All you oil experts out there - do you believe Amsoil 10W-30 will adequately protect my engine during 110° stop and go commutes or would you rather run the Mobil 1 0W-40?
Thanks in advance!
JAC
Two questions:
I have been looking at data sheets for Amsoil and Mobil 1 in various weights. For the most part it seems like Amsoil is slightly "thicker" comparing viscosity at 40°C and 100°C between comparably labeled oils. Does this mean that an oil with higher numbers at certain measured temperatures provides a better (better being more protection) film between moving parts?
The manual to my car states that I may use either a 5W-30 or 5W-40 synthetic oil. Summer is on its way, and my car is due for another oil change. I have used M1 0W-40 before, but my mileage was consistently 1.5-2 MPG less than with M1 5W-30. Looking at Amsoil 10W-30 and using its viscosity at 40°C and 100°C, it seems to bridge the gap between Mobil 1 5W-30 and Mobil 1 0W-40. Gasoline is getting rather expensive here ($2.53/gallon for 91 octane today) so mileage is important to me, but so is the longevity of my car!. All you oil experts out there - do you believe Amsoil 10W-30 will adequately protect my engine during 110° stop and go commutes or would you rather run the Mobil 1 0W-40?
Thanks in advance!
JAC