high miles and oil
03-27-2003, 12:41 PM
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high miles and oil
Hey, my vtec prelude has 191k miles on it. The oil change guy tells me I should use 10-40 oil rather than 10-30 because of the high miles. What
03-27-2003, 05:11 PM
#2
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unless you have some real oil consumption problems stick with 10W30.
10W30 and 10W40 oil are the same when cold. Both are a Viscosity index of 10. The difference lies when the oil is hot or when the engine is at operating temperature. 10W40 oil is slightly more thicker/viscous when its hot. Hence the 30 vs 40.
Honda engines are built really well and even with a high milage there is no reason to use anything different than what is reccomended. Only benifit to going thicker is to reduce oil consumption problems at the expence of increased fuel consumption and possibly increased engine wear.
Hope this helps
10W30 and 10W40 oil are the same when cold. Both are a Viscosity index of 10. The difference lies when the oil is hot or when the engine is at operating temperature. 10W40 oil is slightly more thicker/viscous when its hot. Hence the 30 vs 40.
Honda engines are built really well and even with a high milage there is no reason to use anything different than what is reccomended. Only benifit to going thicker is to reduce oil consumption problems at the expence of increased fuel consumption and possibly increased engine wear.
Hope this helps
03-28-2003, 04:34 AM
#3
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Last I checked, Honda recommended 5W30 for that motor. Unless you are constantly above 80 or 90 degrees, I would recommend dropping back down for fuel economy.
To elaborate on Tugz comments... a thicker oil will generally burn less than a thinner oil (i.e. 10W40 will be consumed less) as it is harder to get past the rings being thicker. But it also will increase startup wear and be harder for the system to move as it is harder to move through the small ports in bearings and such.
My H22A always ran best with 5W30 and didn't feel right or sound right on 10W30. 10W40 would be a serious no-no IMHO.
To elaborate on Tugz comments... a thicker oil will generally burn less than a thinner oil (i.e. 10W40 will be consumed less) as it is harder to get past the rings being thicker. But it also will increase startup wear and be harder for the system to move as it is harder to move through the small ports in bearings and such.
My H22A always ran best with 5W30 and didn't feel right or sound right on 10W30. 10W40 would be a serious no-no IMHO.
03-29-2003, 09:09 AM
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oh, I've been using 10-40 for two oil changes now. I can't realy tell any difference really, but I have noticed a slightly decrease in gas mileage.
What's the diff between 5-30 and 10-30 then?
What's the diff between 5-30 and 10-30 then?
03-29-2003, 10:05 AM
#5
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5w30 has a lower viscosity (thinner) when the oil is cold. Therefore it is beter for cold temperature starting. 5W30 and 10W30 are the same viscosity when Hot.
Just remember this... the first number (ex. 5w30) is the viscosity index when the oil is cold. The last number is the viscosity index when the oil is hot.
So basically a 5w20, 5w30 and 5w40 have the same viscosity when they are cold but are different when its hot.
5W30, 10W30, 15W30 have the same viscosity wneh they are hot but are different when its cold.
I hope this makes sense..
Just remember this... the first number (ex. 5w30) is the viscosity index when the oil is cold. The last number is the viscosity index when the oil is hot.
So basically a 5w20, 5w30 and 5w40 have the same viscosity when they are cold but are different when its hot.
5W30, 10W30, 15W30 have the same viscosity wneh they are hot but are different when its cold.
I hope this makes sense..
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