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Old 04-14-2019, 02:36 PM   #1
Bony_ahmed
 
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Questions regarding 0w40 oil

Is it safe to switch to Mobil 1 0w-40, instead of 5w-30. What are the bad sides of it?

it's summer now in my country, average temps are like 40 c. That's im thinking of switching to 0w40 oil.
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Old 04-14-2019, 03:10 PM   #2
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Your best bet is to use the oil your owners manual recommends for your temperature.
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Old 04-14-2019, 03:34 PM   #3
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I don't think that's safe. In middle East countries and SA, I typically hear about people using 10w30 or 15w30. 0 is like water in ambient temp...

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Old 04-15-2019, 01:14 AM   #4
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My understanding is higher temperatures (above freezing and in excess of 30C regularly meant you should use 10W30.

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Old 04-15-2019, 04:28 AM   #5
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If you are really in Dhaka - why would you want to use 0W oil???
AFAIK the temperature never goes below 0 degrees Celsius there. You should look for 10W50 (you should still be OK even with 20W50 but that is out of Toyota specs I think).
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Old 04-15-2019, 10:49 AM   #6
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Quote:
Originally Posted by komichal View Post
If you are really in Dhaka - why would you want to use 0W oil???
AFAIK the temperature never goes below 0 degrees Celsius there. You should look for 10W50 (you should still be OK even with 20W50 but that is out of Toyota specs I think).
Well i live in Dhaka, and thinking about driving using a thicker oil. My main concern is about the 40 weight, will it ruin the engine and will it drop my MPG?

20w50 is too thick, i think its more meant for track driving.

and also there is no good quality 5w30 in the market here, that's another reason to switch
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Old 04-15-2019, 12:26 PM   #7
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Originally Posted by Bony_ahmed View Post
Well i live in Dhaka, and thinking about driving using a thicker oil. My main concern is about the 40 weight, will it ruin the engine and will it drop my MPG?



20w50 is too thick, i think its more meant for track driving.



and also there is no good quality 5w30 in the market here, that's another reason to switch
0w40 is 0 weight. 40 is the heat resistance.

You really want to look for something 10w, 15w or 20w.

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Old 04-15-2019, 12:40 PM   #8
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Originally Posted by IllusionX View Post
0w40 is 0 weight. 40 is the heat resistance.

You really want to look for something 10w, 15w or 20w.

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Why would you ever want to increase the cold weight of the oil? Even in 90* ambient temps that is still much lower than the 212* operating temp of an oil. A 0w would keep the "cold" start viscocity closest to operating temp viscocity tjat any higher number would.

Oils are thicker at colder temps even multi weight oils. A 5w means it flows like a 5 weight oil at 0* and a 0w oil flows like a 0 weight at 0*. It does not mean the oil weight is 5 or 0 at 0*. If that was the case than our passenger car pil would be thinner after being left in the freezer than it is left on the shelf

To the OP, are you monitoring pil pressure? If you are not then you have no reason to increase your oil weight above the factory spec. The only need for this is if you are suffering from oil pressures below Toyota's spec.
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Old 04-15-2019, 01:50 PM   #9
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Originally Posted by tmontague View Post
Why would you ever want to increase the cold weight of the oil? Even in 90* ambient temps that is still much lower than the 212* operating temp of an oil. A 0w would keep the "cold" start viscocity closest to operating temp viscocity tjat any higher number would.

Oils are thicker at colder temps even multi weight oils. A 5w means it flows like a 5 weight oil at 0* and a 0w oil flows like a 0 weight at 0*. It does not mean the oil weight is 5 or 0 at 0*. If that was the case than our passenger car pil would be thinner after being left in the freezer than it is left on the shelf

To the OP, are you monitoring pil pressure? If you are not then you have no reason to increase your oil weight above the factory spec. The only need for this is if you are suffering from oil pressures below Toyota's spec.
I'm not monitoring oil pressure, okay i think i got it.
thanks man !!!
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Old 04-15-2019, 07:17 PM   #10
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Originally Posted by tmontague View Post
Why would you ever want to increase the cold weight of the oil? Even in 90* ambient temps that is still much lower than the 212* operating temp of an oil. A 0w would keep the "cold" start viscocity closest to operating temp viscocity tjat any higher number would.

Oils are thicker at colder temps even multi weight oils. A 5w means it flows like a 5 weight oil at 0* and a 0w oil flows like a 0 weight at 0*. It does not mean the oil weight is 5 or 0 at 0*. If that was the case than our passenger car pil would be thinner after being left in the freezer than it is left on the shelf

To the OP, are you monitoring pil pressure? If you are not then you have no reason to increase your oil weight above the factory spec. The only need for this is if you are suffering from oil pressures below Toyota's spec.
If we will switch to higher weight, say 10W50 from 0W40, is there an effect in the car MPG?
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Old 04-15-2019, 08:56 PM   #11
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Yes, your mileage will go down as your operating temp oil weight is going from a 40 to 50. It shouldnt hurt your fuel efficiency a ton, but it will have a negative impact.

Why the heck would you want to run a 10w50 in the 1nz? Even with 300* oil temps you would be way out of oil pressure spec and have potential flow issues. On top of that your oil temps would be much higher
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Old 04-16-2019, 01:10 AM   #12
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Originally Posted by tmontague View Post
Yes, your mileage will go down as your operating temp oil weight is going from a 40 to 50. It shouldnt hurt your fuel efficiency a ton, but it will have a negative impact.

Why the heck would you want to run a 10w50 in the 1nz? Even with 300* oil temps you would be way out of oil pressure spec and have potential flow issues. On top of that your oil temps would be much higher
Thanks tmontague for your reply. Would like to clarify that 10W50 is only a scenario. My yaris (1.5L 1NZ Auto Trans) is currently used Toyota recommended 5W30 oil since the 5W40 (used up to 20k kms) is not available anymore in the dealership.

So, what engine oil grade would you recommend for summer and heavy traffic situations that will increase fuel efficiency and protecting the engine? The car is 3yo and 52k in its odo. Just like Bony_ahmed Im considering to switch to 0W40 if it is safe and can satisfy those aims.

thanks a lot in advance.
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Old 04-16-2019, 01:46 AM   #13
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Originally Posted by jhonz1981 View Post
Thanks tmontague for your reply. Would like to clarify that 10W50 is only a scenario. My yaris (1.5L 1NZ Auto Trans) is currently used Toyota recommended 5W30 oil since the 5W40 (used up to 20k kms) is not available anymore in the dealership.

So, what engine oil grade would you recommend for summer and heavy traffic situations that will increase fuel efficiency and protecting the engine? The car is 3yo and 52k in its odo. Just like Bony_ahmed Im considering to switch to 0W40 if it is safe and can satisfy those aims.

thanks a lot in advance.

Hi, just use 5w30 conventional lube oil (non-synthetic) if you live in Cebu City area.. I am a native of Cebu too but currently my family is in KSA.. Cebu City driving, you cannot exceed 100kph at most you are driving at 60-80kph and normally you are in traffic areas. So to save money better use dino oil and replace it every 5000km, that is simple, it doesnt hurt your pocket... But if you plan on travelling daily just like i do for +100km then i suggest to go for fully synthetic 5w30.

The manual says to use 5w30 for vios/yaris 1.3L in our region.
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Old 04-16-2019, 03:38 AM   #14
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Hi, just use 5w30 conventional lube oil (non-synthetic) if you live in Cebu City area.. I am a native of Cebu too but currently my family is in KSA.. Cebu City driving, you cannot exceed 100kph at most you are driving at 60-80kph and normally you are in traffic areas. So to save money better use dino oil and replace it every 5000km, that is simple, it doesnt hurt your pocket... But if you plan on travelling daily just like i do for +100km then i suggest to go for fully synthetic 5w30.

The manual says to use 5w30 for vios/yaris 1.3L in our region.
hi kababayan rayfloyd170,

Yes, I live here in Cebu (particularly in Lapu-lapu). The car has an average usage in a week of around 370kms and can reach or even exceed 100kph while travelling to north (100kms away from Cebu City) on weekends.

Traffic situation particularly on Saturday afternoon is awful. Sometimes it took 1hr from here to SM Consolacion (approx. 11kms) when in fact you can just have it 15-20 minutes only if you drive at dawn. So Im thinking to switch to 0W40 if this is good for fuel economy and at the same time protect the engine from the extreme heat cause by heavy traffic and the summer.
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Old 04-18-2019, 05:40 AM   #15
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hi kababayan rayfloyd170,

Yes, I live here in Cebu (particularly in Lapu-lapu). The car has an average usage in a week of around 370kms and can reach or even exceed 100kph while travelling to north (100kms away from Cebu City) on weekends.

Traffic situation particularly on Saturday afternoon is awful. Sometimes it took 1hr from here to SM Consolacion (approx. 11kms) when in fact you can just have it 15-20 minutes only if you drive at dawn. So Im thinking to switch to 0W40 if this is good for fuel economy and at the same time protect the engine from the extreme heat cause by heavy traffic and the summer.

I would rather stick to the manual which says 5w30 oil, 370kms a week and with excess speed of 100km/hr is nothing for a conventional oil as long as you replace it regularly at 5000km interval... but if you have the extra money then why not go for 5w30 fully synthetic which is more than 2.5x the cost in our country... however you can benefit one thing and that is TIME in going to the shop since you will visit the shop for oil change once every 10k km.

As for engine protection, during heavy traffic in Cebu/Mactan, i believe fully synthetic oil is excellent but conventional oil is more than sufficient to do the job too.. Unless you rev your engine at past 3500-4000 all the time (above 120km/h) even at this condition i see my coolant temp at average 85-87deg C.. Oil temp could be higher let say +10C and can be handled by Conventional oils with ease..

Regarding your question on 0w40, if that is written in your vios manual then go for it. Otherwise you will have warranty problems if your car is new and under warranty.

I have seen a lot of guys in this forum use 5w30 with their yaris/vios... In middleast (hot weather averages 45-50degrees during summer) Toyota manual says to use 5w30...

Fuel economy will be out of your hand when you are driving in traffic (like cebu/mandaue/mactan areas). Personally i tried driving on a free highway with my OBD and android phone as gauge and i have seen that during light traffic my fuel consumption goes down to ave 11-13km/liter... during heavy traffic (comparably in cebu city area/mandaue city) maybe 9-12km/liter... But when i am on a highway and moving freely at 85-90km/hr my fuel consumption is very nice at above 18km/liter but if i rev the engine like 3500-4000+ to speed up like 120/130+ km/hr i will just average at 12-15km/liter...

Regards,

Last edited by rayfloyd170; 04-19-2019 at 08:16 AM.
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