5w30 vs. 10w30

[Bagger_Matt]

My local dealer recommends 10w30 in my v6 toyota.
but the manual says to use 5w30, any harm using 10w30 over 5.

 

[Ken2]

If very cold 5w30 is the oil to use. Otherwise I prefer to use the heaviest oil allowed by the manual. The car makers are pressured to improve fuel mileage every tenth of a mph they can, and 5w30 does give a miniscule mileage improvement.


Ken

 

[GROUCHO MARX]

The dealer probably only buys 10w30 in bulk.

 

[TR3-2001SE]

I think you will find a difference when you go to start you vechicle and it is 5 degrees outside. It will turn over much faster and hopefully get oil to the right parts quicker. During the rest of the year no difference.

 

[Drew99GT]

Below 0 you may be asking for trouble, but if it rarely if ever gets below 0 in your area, then you'll be good.

 

[LarryL]

superglide, maybe your dealer has a better engineering staff and test facility than Toyota and is basing his recommendation on his concern for the well being of your vehicle. You're lucky to find a dealer that knows so much about engine oil. I'll bet that between him and his oil supplier you've discovered a resource that is one of the reasons you'll keep comming back for service. And, if he is making improvements to your service schedule on engine oil, just imagine what other imporvements he is making for you. Those factory specs just haven't been tested across a large number of vehicles and miles like a good dealer would do. 5w30 may be better in every way for a Toyota engine, except when the dealer steps up to help with yor specific situation. If you really want in on the dealer's secrets, go look at the barrel he pumps oil from. Some have a special code for the good stuff, it's '30WHD' or '10W30HD' and there are dealers that put it in everything. Your dealer has local knowledge and they depense that through Service Writers. If you have a problem with anything to do with warranty, just tell Toyota you got your information from a Service Writer. Using 10w30 is exactly what the dealer means when he says they are going to change your oil...change it from 5w30 to 10w30 or if you're really lucky they will use the good stuff, the 30WHD. Also be sure to get a second opinion. Try an independent consultant with industry backing, a Jiffy Lube, for example. There is no such thing as being too careful.

 

[pitzel]

quote:

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Originally posted by LarryL:
superglide, maybe your dealer has a better engineering staff and test facility than Toyota and is basing his recommendation on his concern for the well being of your vehicle. You're lucky to find a dealer that knows so much about engine oil. I'll bet that between him and his oil supplier you've discovered a resource that is one of the reasons you'll keep comming back for service. And, if he is making improvements to your service schedule on engine oil, just imagine what other imporvements he is making for you. Those factory specs just haven't been tested across a large number of vehicles and miles like a good dealer would do. 5w30 may be better in every way for a Toyota engine, except when the dealer steps up to help with yor specific situation. If you really want in on the dealer's secrets, go look at the barrel he pumps oil from. Some have a special code for the good stuff, it's '30WHD' or '10W30HD' and there are dealers that put it in everything. Your dealer has local knowledge and they depense that through Service Writers. If you have a problem with anything to do with warranty, just tell Toyota you got your information from a Service Writer. Using 10w30 is exactly what the dealer means when he says they are going to change your oil...change it from 5w30 to 10w30 or if you're really lucky they will use the good stuff, the 30WHD. Also be sure to get a second opinion. Try an independent consultant with industry backing, a Jiffy Lube, for example. There is no such thing as being too careful.

---

Is this supposed to be sarcasm?

 

[Fuelrod]

It sounds pretty accurate, except there is no such oil as "30W". Most, but not all, 20 weight oil can earn the "winter" service designation. But no single grade 30 weight dino oil can...

 

[TallPaul]

quote:

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Originally posted by Fuelrod:
But no single grade 30 weight dino oil can...

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I was under the impression that some straight 30 dino oils could pass the 20w test, but generally they are not tested for cold properties.

 

[Blue99]

And, per TallPaul's post, an example of a straight 30 that could also be designated 20W-30. Note that the 20W requirement is 9500 max cP @ -15C:

Phillips 66 Super HD II Monograde SAE 30

Cold Crank Viscosity - 3493 cP @ -15C
Viscosity @ 100C - 11.1 cSt

 

[TallPaul]

quote:

---

Originally posted by Blue99:
And, per TallPaul's post, an example of a straight 30 that could also be designated 20W-30. Note that the 20W requirement is 9500 max cP @ -15C:

Phillips 66 Super HD II Monograde SAE 30

Cold Crank Viscosity - 3493 cP @ -15C
Viscosity @ 100C - 11.1 cSt

---

Now pour in a bottle or two STP and you might have a 20w50.

 

[Bagger_Matt]

Dear LarryL,

If you have a problem with dealers, you can call 1-800-go-toyota. I did and they told me to go with my local dealers recommendation. They said the 5w30 was based on a large area of the country, and that the local dealer would know whats best for my climate.

But thanks for all of your helpful info, its easy to see your concern for helping people!

 

[Gene K]

Which Toyota? USA, which recommends the same oil for most climates?

Toyota Coporate (Japan) which recommends different oils for different climates which are seldom 30 weights?

Gene