it is bad if I put oil 10w 30 in my 2009 toyota Tacoma

I am sure Toyota has no idea what oil is best. I'm also sure it's probably a conspiracy. 10W30 might be the miracle that keeps your otherwise unreliable Toyota going forever. hmm
Do whatever helps you sleep. Just don't complain when your mileage drops, or something goes wrong.
And yes, I'm a sarcastic A-hole.

 

I'm using Amsoil 0W-30. We see some pretty good temperature extremes in Dakland, -40 in the winter to +95 for couple weeks in the summer, add to that some light towing. Your 10W-30 probably will not ruin your engine but given how sensitive newer engines are your mileage may suffer some. All my vehicles operate in a severe environment as described in your owner's manual, which accelerates the general maintenance requirements of the vehicle.

 

XW-30 will void the engine warranty.

 

I'd like to know too. If the whatever brand oil you're using meets the service requirements how can it void the warranty?

 

I am assuming that only 5W-20 and 0W-20 are recommended for your truck?
I should have put it this way If there is a warranty issue with the engine that can be remotely blamed on lubrication (including the oil pressure operated variable camshaft timing) and they find out you've been using an oil that is not specified in the owners manual, it's on you.
No company will warranty an issue related to a disobedience of the manual. They will call it abuse.
--I think it even says that in the fine print in the separate warranty booklet, but I don't remember that for sure.
Having said that I use API service SL oil rather than SM because of the higher zinc. But I do use the recommended weight.
Just be careful with the warranty.

 

I fear your engine will blow in 200,000 miles or so.

 

Aha.
Well the 10W-30 shouldn't hurt it. Check that it's recommended during warranty though.

 

I would take Chris4X4's word. Use 5w-30 through warranty. If you decide to use a different weight after warranty, go-for-it

 

Toyota would have every right to void warranty if you are not using the spec'd oil, and it was found to be a factor in a mechanical failure. The magnasson moss act only protects the consumer, if they are using an equivalent to the spec'd product. __W30 is not the same as __W20. Bottom Line.

 

I agree. Just read the owners manual. That's all they have to do. Anything else is a risk.
I don't really know why, if someones engine is supposed to run 5W-30, that they would want 10W-30 in it.
The problem with oil is that it thickens too much to lubricate properly when it's cold. 5W-XX is just better. It's still acting like a 30 at running temperature.

 

Man, I'm a little annoyed. I had been running 5w-30 (what the Toyota dealers had been putting in) and today I didn't feel like driving all the way up to Toyota so I took it into a Tire Kingdom close by and they put in 10w-30.

Being summer in Florida though I'm not overly concerned...just gonna be more careful when I take it into places. I'll test this decreased mpg theory this weekend and see if there is anything noticeable in performace/mileage.

 

When the vehicle starts up, the engine is at its most inefficient state (cold). The thicker the oil, the more inefficient it will be until the engine, and the oil is up to temperature. So it will make a difference, more so in colder weather, climate. The second # in oil viscosity applies at 100C...(212F). So theoretically under 212F, you are higher on a descending Temperature / Viscosity curve, the W30...

 

The 2004 Silverado I used to own called for 5w30 for all temps or 10w30 as long as the temp is above 0 degrees. I ran both weights and never really noticed a difference in mpg.

 

Whatever it may call for, I'll always use what's recommended for my vehicle.

 

First tank in and was I was about 2 mpg below normal...but it was night highway driving which always yields lower results for some reason. I'm filling up in the am which is a mixture of mostly highway and some city, which should be more accurate.

 

thought they want u to run 5w-30.. thats it it says on mines...

 

Hi,

I've been watching for a while and thought I might jump in on this discussion.

Around 40k my 2005 2.7 started making a bit of cold-start piston slap noise. After being reassured by everyone that it really wasn't anything major to worry about I started to try to see what oil might be the best to use. Or at least, to see if any oil reduced the cold-start noise.

I contacted Red Line, Royal Purple and Mobil 1 for their advice (I can provide their responses for anyone that would want to read them. And the Mobil 1 response is on their site). What they all said goes contrary to the manual. But I believe their advice is still correct.

Red Line and Royal Purple said to use 10w30 and go thicker if necessary. Mobil 1 said to use 15w50! But they all had the same thought in mind. The 10, would drain down less overnight. It would leave a better coating for that cold start. Guess what? It does! There is a noticeable reduction in noise for cold starts. Fortunately, here in SC there aren't very many mornings where the tempearture is below 20 degrees.

So what's the truth? First there is gas mileage. Auto manufacturers are willing to sacrifice a little bit of longevity to better their fleet average. Please see: http://www.machinerylubrication.com/article_detail.asp?articleid=518&relatedbookgroup=Maintenance

Next there is cold temperature viscosity. For most of the continental US the cold pour temps for a 10 is more than safe. And this is even more the case with synthetics. Look at the charts from Red Line comparing viscosity and pour temperatures. Unless you live in Alaska, or frost byte falls you won't hurt anything with a 10w30.

So my advice. First, for warranty reasons, do what the manual says. Unless, like my Tacoma, you want to give it a little help. You won't hurt anything and you might actually be helping.

If I had stuck to 5w30 instead of using 10w30 would it have really hurt anything? Probably not. But it's nice to start my truck on a 35 degree morning and hear a noticeably quieter engine.