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Old 07-12-2018, 01:27 PM   #1
RicStyx
 
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Oil weight

I'm curious as to what weight of oil everyone uses. On my last service, toyota used 15W-40 which came as a shock. Now the book states it can be used but either 0W-20 or 5W-20 is also acceptable which I feel is a far better weighted oil for a small engine and according to the temperature range application can do more. What is everyone's opinion and what do you use?

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Old 07-12-2018, 01:45 PM   #2
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Ask "toyota" why 15w-40 was used on this oil change. (please bring answer here. I don't like giving up ANY engine life/protection for the efficiency gain of thin oil...understanding that too thick on cold winter starts isn't good for the engine either.)
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Old 07-13-2018, 06:34 AM   #3
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When I asked they stated it was the general based oil they use on the smaller petrol engines, they also stated due to our climate it is the right oil to use. However, if i follow the weight guide in the book, the range for lighter oils have more versatility than the heavier used in my car. Temperatures rarely drop below 10 degrees here and its for a short amount of the year, otherwise its in the mid 20s to 30s.

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Old 07-13-2018, 09:44 AM   #4
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I run 5W-30 Full Synthetic
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Old 07-13-2018, 10:09 AM   #5
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I'd then ask why 15w-40 rather than the common 10w-40.
(10F or 10C?)
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Old 07-13-2018, 10:13 AM   #6
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I run 5W-30 Full Synthetic
same here.
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Old 07-13-2018, 10:28 AM   #7
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5w30 full syn during the summer at the track (260 degree oil temps and pressure is fine) and I run 0w30 full syn during the winter.

The problem on forums when discussing oil now a days is that there are many people who have been around cars for a couple decades or more but oil technology has come leaps and bounds in the past 10 years. This leads to much advice not necessarily being correct in today's world although it was smart not a long while ago.

Case in point - thicker oils offer more protection. Not necessarily true anymore although this would have been the case back when single weight and dyno oils were the main stay.

There are a tremendous amount of studies published online that have been performed on new full syn oils of varying weights and their effect on engine components. Problem is these are not always known and are not easy to read not are they fun to read so they often get passed over.

Take home point - run a UOA if you want to know how your oil stacks up. This is how I know I can run 20,000km oci's on my oil with track use
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Old 07-13-2018, 10:49 AM   #8
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Quote:
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I run 5W-30 Full Synthetic
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same here.
Me too.
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Old 07-13-2018, 05:40 PM   #9
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Middle East and African countries seem to use quite heavy weight oil. 10w50, 15w40 is regularly seen being used.a

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Old 07-14-2018, 11:38 PM   #10
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I am lucky , I can get any weight I desire, right now I'm using 5w-30, I don't think I am sacrifice any engine e life over using a 10w30 or 10w40

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Old 07-15-2018, 11:02 AM   #11
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I am lucky , I can get any weight I desire, right now I'm using 5w-30, I don't think I am sacrifice any engine e life over using a 10w30 or 10w40

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I don't think you'd sacrifice engine life. You'd be better protected with heavy weight on a 115F cold start than with 5w30.

I'm sure you don't see this kind of temperature in CT.

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Old 07-16-2018, 02:14 PM   #12
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Luckily, I don't see those temps. I see the 90's but that's about as high as it goes.


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Old 07-17-2018, 09:32 AM   #13
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Here in the US, 15w40 is the commonly used weight for big truck diesel. I'm not even sure a 15w40 is sold here that doesn't have the diesel engine additive package.
It's not an oil formulated for cars. You can use 15w40 for a car, but it isn't ideal.
Of course being OP is in S.A. could change all of that.
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Old 11-12-2018, 07:51 PM   #14
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Hey, I have an '07 h/b, a/t, w/86k mi. Does anyone use 0W-20 on the 1.5 1NZ-FE in cold weather? I've used 0W-30 and syn 5W-20 in winter, but not 0W-20 yet. Car is not run hard, 'hypermile' type driving 100% of the time, if that matters. Thx!
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Old 11-12-2018, 08:42 PM   #15
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The 1nz in NA iirc specs 5w30, 0w30 can be used without issue, 0w20 would also likely be fine but isn't technically what the manual specs.

If your focus is fuel efficiency then it may be of slight benefit to you.

I use various oil weights in my 2zr engine even though it calls for 0w20 in NA (calls for a different weight in warmer climates). I do this based on my oil temps as a stock engine operating temps for oil are about 220F summer and 180F winter.
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Old 11-12-2018, 10:11 PM   #16
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thx tmontague :-)
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Old 11-13-2018, 03:09 PM   #17
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use what is specified in the manual unless your going modified or live in an exceptional climate.
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Old 01-17-2019, 04:05 AM   #18
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Quote:
Originally Posted by IllusionX View Post
Middle East and African countries seem to use quite heavy weight oil. 10w50, 15w40 is regularly seen being used.a

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I am in Saudi Arabia and run using full syn 5w30 all year long from summer reaching average 45 deg C and winter at ~5deg C... This is also what is stated in my manual... But toyota service center dont have the fully synthetic 5w30 available hence i used 3rd party brand lube...
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