Is 5w-30 OK? For Vitz in summers?

[crude101]

The oil viscosity range is Japanese translation. No harm in 5w30 or 5w40 both.

[ahmedstudio]

What is 5 and 40 in 5w40? What do these numbers mean?

[hash737]

Google it.

[tmkhan4]

You engine temperature can raise above 90 if your cooling system is not working or ambient is already high. At high ambient radiators are having difficult time in dissipating heat to atmosphere. It is same as if you are cooling your room with AC in hot summer and in winter.
Oils gradation:
5w30 means that Oil behaves as SAE grade 5 when cold (W stands for winter) and at 100 degC it behaves as SAE grade 30. It does not mean that Oil has higher viscosity at 100 degC. Viscosity drops with temperature. There is co-relation with viscosity (Cst) and SAE grades.

If someone is using viscosity (grade) higher than required, then he/she is not getting full efficiency from fuel. A significant portion of energy is being consumed by piston to move against viscous oil rather than moving the car.

[Xulfiqar]

I wonder how the ultra cheap manufactured ford V8s survive for half a million miles (900,000 kms) - on the cheapst 5W20 oil you can buy. If you think Lahore is hot, come over to visit phoenix arizona - where your plastic trash cans actually melt in the sun. (above 50C)

[rajaahmed96]

Means environmental changes or ambient temperature doesn’t have any effect on car engine. So i should be shift back to 5W30 on next oil change.

[ahmedstudio]

5W30 is good for Toyota Belta 1.3 in Lahore ?

[Xulfiqar]

you bet it is. anything thicker will be hurting the engine.

Please let go of the "sunn sannata engine" standard of hazrat ustaad in wooden cabin smoking pot.

You have a DOHC, cast aluminium ultra lightweight engine meant for a shoebox/shopping trolley. Its very thin walled and rings/resonates a lot

[Xulfiqar]

It does, thats why the best idea is to always contact manufacturer - in this case toyota who say that 5w30 is perfect for this engine year round from -15C to +48C

[rajaahmed96]

What in the case of honda civic

[ahmedstudio]

I have been using 10W40. Is 5W30 better for Toyota Belta 1.3 2 SZ engine?

[Xulfiqar]

yep, I own a cheapo toyota too, (i treat it like dirt) - its a camry 2.4 which has 300,000 kms on it now.

I use the cheapest 5w30 oil in it with cheap fleet type oil filters. Still going like a well oiled clock.

[AffaanAlAziz1]

Sir for which kind of condition 5w40 should be used?

[tmkhan4]

You can always start with lower grades to get maximum fuel efficiency. Once you start reducing oil (Usually 1 L for 5 to 600 km should not be a problem. You will find this in most of car manuals) you go for slightly higher grade. For Lahore and Islamabad, 5w30, 5w40 is good.
And I do not agree using cheap oil. There are range of additives in the oil. Antoxident prevent oxidation of oil. If oil gets oxidized, it produces acid which corrodes engine. Dispersants cleans engine. Viscosity index modifiers helps keep viscosity difference minimum when hot and when cold etc.
Cheap oil, either they do not add or add low quality additives.
I myself use MANNOL 5w30 in BRV in Islamabad and I changed after 17000 km.

[Xulfiqar]

whatever engine manufacturer says to use it,

e.g. mercedes benz and BMW say to use their own spec 5w40 year round. Benz and BMW are built a bit looser (dheela) - heavier oil works here.

Ford, GM, toyota, Honda etc. are built quite tight now and to maximise fuel efficiency use the lightest oil possible. No problem with that as long as the sump capacity and oil temperature is kept under control.

[haseeb.basharat]

Google the concept of thermodynamics.

[AffaanAlAziz1]

Lovely sir. At the same the corollas manual recommends 10w30 as well as 20w50. Why is it so.

[AffaanAlAziz1]

Moreover Toyota dealerships pour 5w50 in the new cars.

[Mirza967]

Sir 20w-50 in grande has been seen with my sinful eyes being poured at Toyota dealership

[tmkhan4]

20W50 is made from cheap mineral oil. They pour it and then ask you to change very often so that they can make money. A fully synthetic oil, you can easily drive for 10,000 km. No oil changing shop or company would tell you this.