[cfa]

Hi Sifus,

My Waja CPS Manual Statted Engine Oil is 10w30.

Unfortunately, 10w30 only comes in 3L and 1L pack and most of the time, the 1L pack is sold out. So buying 6L of Oil is quite expensive and having the balance sitting idle for 3-mths is also not very good.

So, I decided to use 10W40 and frankly, I don't feel any difference in performance or FC. But recently hands itchy, saw that there is also a 5w30 4-L pack.

So, want to ask the Sifus here, which oil is better as a substitute to the original recomened 10w30.

Is 10w40 or 5w30 better? TQCM

[hcgui]

Hi Sifus,

My Waja CPS Manual Statted Engine Oil is 10w30.

Unfortunately, 10w30 only comes in 3L and 1L pack and most of the time, the 1L pack is sold out. So buying 6L of Oil is quite expensive and having the balance sitting idle for 3-mths is also not very good.

So, I decided to use 10W40 and frankly, I don't feel any difference in performance or FC. But recently hands itchy, saw that there is also a 5w30 4-L pack.

So, want to ask the Sifus here, which oil is better as a substitute to the original recomened 10w30.

Is 10w40 or 5w30 better? TQCM

theoritically, 5W-30 shud give better fuel economy and revs easier. but some engine do make more noise with thinner oil, like my own Campro 1.3L. i'm using either 15W-40 or 10W-40.

however, if u've tried that viscosity and dont face any problem whatsover, then it's probably okay, provided it's recommended by the manufacturer in the first place.

i do know one brand that has 10W-30 in 4L pack. Mobil 1000x2, made in Singapore.

[YSW]

theoritically, 5W-30 shud give better fuel economy and revs easier. but some engine do make more noise with thinner oil, like my own Campro 1.3L. i'm using either 15W-40 or 10W-40.

however, if u've tried that viscosity and dont face any problem whatsover, then it's probably okay, provided it's recommended by the manufacturer in the first place.

i do know one brand that has 10W-30 in 4L pack. Mobil 1000x2, made in Singapore.

Usually lubrication on valve train, especially in the case of flat tappet, such as Campro will be partially boundary lubrication and partially hydrodynamic lubrication. In the case of hydrodynamic, higher viscosity oil does make some improvement in sound dampening but a thinner oil can also provide a adequate sound dampening with good boundary lubrication. Boundary lubrication is very much about the good quality anti wear and extreme pressure additive within the oil.

[vr2turbo]

Hi Sifus,

My Waja CPS Manual Statted Engine Oil is 10w30.

Unfortunately, 10w30 only comes in 3L and 1L pack and most of the time, the 1L pack is sold out. So buying 6L of Oil is quite expensive and having the balance sitting idle for 3-mths is also not very good.

So, I decided to use 10W40 and frankly, I don't feel any difference in performance or FC. But recently hands itchy, saw that there is also a 5w30 4-L pack.

So, want to ask the Sifus here, which oil is better as a substitute to the original recomened 10w30.

Is 10w40 or 5w30 better? TQCM

If recommended 10w-30 you can also use 5w-30. Pennzoil have SS 5w-30 in 4L pack. However you can to try 10w-40 and see which viscosity you prefer....

[vr2turbo]

Usually lubrication on valve train, especially in the case of flat tappet, such as Campro will be partially boundary lubrication and partially hydrodynamic lubrication. In the case of hydrodynamic, higher viscosity oil does make some improvement in sound dampening but a thinner oil can also provide a adequate sound dampening with good boundary lubrication. Boundary lubrication is very much about the good quality anti wear and extreme pressure additive within the oil.

You are technical sifu....
For my VR with hydraulic lifters I tried 5w-30 before. Is very quiet during cold start but becomes very noisy when warmed up. So have to stick back to 5w-40 or even 5w-50 viscosity...

[cfa]

Thanks all sifus for your feedback.

Will try 5w30 for next oil change and observe

[YSW]

You are technical sifu....
For my VR with hydraulic lifters I tried 5w-30 before. Is very quiet during cold start but becomes very noisy when warmed up. So have to stick back to 5w-40 or even 5w-50 viscosity...

5w30 gave you quiet cold start because 5w30 flow fast enough in low temperature to provide lubrication, as the engine temp rise, the engine oil will become thinner and hydrodynamic lubrication on the valve train should be complimented with good boundary lubrication...... It is quite clear that the oil you are using did not provide sufficient boundary lubrication and hence you are forced to rely on hydrodynamic lubrication where you had to shift to higher viscosity....

I guess you should look for oil that perform better on boundary lubrication.