Question about motor oil
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Freshman User
Joined: May 2005
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Question about motor oil
I just bought 4 gallons of oil to do my oil change. I went with Shell Rotella T synthetic 5W 40. I noticed the fossil oil came in 15w 40 which is the weight that Ford reccomends for warm weather use and the synthetic only comes in 5W 40 (the same was true with mobil 1 synthetic truck and SUV).
My question is (assuming I understand oil weights) that the 5W 40 is like a 5 weight when cold and a 40 weight when warm. Will the oil be too thin to protect my motor at startup on warm days? Should I only use 5W 40 during the winter when I need a thinner oil for easy startup? Will I hurt the motor if I run it while it is still cool with the 5W 40? Do I need the extra protection of 15 weight while the motor is cool or does the 5W 40 cover all the weights in between when it is cold?
Thanks for the help, I could use some help from the oil experts!
My question is (assuming I understand oil weights) that the 5W 40 is like a 5 weight when cold and a 40 weight when warm. Will the oil be too thin to protect my motor at startup on warm days? Should I only use 5W 40 during the winter when I need a thinner oil for easy startup? Will I hurt the motor if I run it while it is still cool with the 5W 40? Do I need the extra protection of 15 weight while the motor is cool or does the 5W 40 cover all the weights in between when it is cold?
Thanks for the help, I could use some help from the oil experts!
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Joined: May 2004
Posts: 1,366
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From: Northern Utah
Remember the movie Indiana Jones and the Last Crusade... When the Saint told Indiana "You have chosen wisely" when he drank from the wooden cup?
dhelm, You have chosen wisely!!! The 5w40 synthetic will treat you right
with a wider viscosity range: The benefits of a thinner weight during cold starts and a heavier weight in warmer/hot driving temps- Similar to a Porterhouse steak: The best of both worlds with a filet and a bone-in New York steak!
dhelm, You have chosen wisely!!! The 5w40 synthetic will treat you right
with a wider viscosity range: The benefits of a thinner weight during cold starts and a heavier weight in warmer/hot driving temps- Similar to a Porterhouse steak: The best of both worlds with a filet and a bone-in New York steak!
Last edited by utahtom; May 11, 2005 at 09:34 PM.
