uses0ap

is it safe to use 10w-40 motor oil? if it makes a difference, the weather over here is getting HOT.

thanks

TunerN00b

Safe? Yes.

Overkill? Probably.

8zero8

5-20 OR 5-30.. unless the 10-40 is free.

dc2teg99

its safe.. oil is oil it will thin out when it gets hot... i heard of guys running 20w50.. due to small leaks and stuff and its fine .. i believe the weight class of the oil make more of an impact if you live a cold area where its like 14 degrees or something like that, i guess it too thick for it to thin out in a reasonable amount of time... but not an issue here in cali...

boosteddohczc

10 40 will work but i wouldn't run anything but 10 30... Its safe in all weathers and ive never had a problem with it

nsxtasy

If you look in the owner's manual and service manual, you will see that Honda specifies 5W30 as the preferred viscosity at all temperatures. It says you can also run 10W30 as long as the outside temperature doesn't go below 20 degrees F, but 5W30 is preferred at all temperatures. They do not recommend 10W40.

vikrant2807

Hi . I have a civic 98 and on last service I used 5w-30 castrol but when I drive my car at morning. It feels responsive much more powerfull but as soon as it reach its operating temperature it lags in power no responsiveness.
Now what should I use 5w-20 or 5w-40
My car has 100 thousand miles on it.

HondaPartsHero

5w30 is what Honda recommends. The oil viscosity is not the cause of your unresponsiveness.

PatrickGSR94

iTrader: (1)

Honda says 5w30. I recommend 0w30 myself. The cold viscosity is NEVER going to be thin enough to properly lubricate the engine as it is at operating temperature, but the thinner the better when it's cold, that would be 0w30. I would never, ever use anything thicker than a 30 weight oil unless you run loose bearing clearances.

I run Mobil1 0w30 on my GS-R with 325K miles on the original engine with no problems at all. Change it every 6K miles. In that time it might lose 1 quart at most.

Solster

How do they come up with this rating . . .really?
Most of the time when viscosity is explained words are used that are too technical for the average person to quickly grasp. This leaves them still wondering what the viscosity numbers really mean on a bottle of motor oil. Simply put, viscosity is the oil's resistance to flow or, for the layman, an oil's speed of flow as measured through a device known as a viscometer. The thicker (higher viscosity) of an oil, the slower it will flow. You will see oil viscosity measurement in lube articles stated in kinematic (kv) and absolute (cSt) terms. These are translated into the easier to understand SAE viscosity numbers you see on an oil bottle.

OK . . .What does a 5W-30 do that an SAE 30 won't?
When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. The numbers without the W are all tested at 210° F or 100° C which is considered an approximation of engine operating temperature. In other words, a SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 210° (100° C). The difference is when the viscosity is tested at a much colder temperature. For example, a 5W-30 motor oil performs like a SAE 5 motor oil would perform at the cold temperature specified, but still has the SAE 30 viscosity at 210° F (100° C) which is engine operating temperature. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system. The advantages of a low W viscosity number is obvious. The quicker the oil flows cold, the less dry running. Less dry running means much less engine wear.

S2BumpsticksGSR

I've used 10W-40 for years w/no probs on Bseries... in Arizona it gets f*n HOT!

LSV_EK

i run 5w-30 for years and its never given me any problems.