Hi, everyone,
For some reason, I felt like during the hot Texas Summer I would run Syn 10W30 as an extra margin of protection. Would normally run 5W30 during cooler part of year. I have a 2007 RX350. Am I just kidding myself, or, am I ok? I don't want to damage the engine in any way.
Thanks for your responses.

 

it's not a big deal. you should run 5w30, 0w20 or 5w20

http://www.bobistheoilguy.com/forums...Number=2457090

 

since your car calls for xw-20/30..

if you want to FEEL safe.. i would just run a thinner 5w-30 all year around in texas..

like mobil 1 EP 5w-30, and just change it out 5k~7k miles.. that's just my OPINION...

 

5W-30 all year round, per Manual, can not go wrong. Full synthetic of course.

 

Yup, I go with these guy`s ^^^^. Believe it or not, the engine will run cooler on the recommended viscosity. Never go up in viscosity unless the motor has some other kind of problems going on. And even then you would only be masking the problem.

 

5W30 or 0W30

 

Both the 10w30 and 5w30 will be 30 weight oil (the second number) at operating temperature, so switching to 10w30 will not offer you any additional benefit despite the ambient temperature being high where you are.

Have a look at the attached chart that I received from Lexus Canada. You can run 5w30, 5w20 or 0w20 in the 2007 RX. The 20 weight might actually help the engine run cooler, believe it or not. I've attached it as picture and a .pdf so you can download a copy of the .pdf is so desired.

 

LOL...just noticed someone posted a link to my post at bobistheoilguy.com. I also have a chart for Toyota vehicles posted at that site and this site, if you happen to own a Toyota.

 

rcy is the oil guy

 

Thanks, everyone. If I change back to lighter weight at next change is that ok? Sorry to be such a knucklehead.

 

yes, that is fine.

 

It is official now...... No more Bob is the oil guy. It has been changed to rcy is the oil guy!!

 

Lol...no, I don't know that much about oil.

What I do know how to do, is to pester auto makers with phone calls and emails until they cough up the information I'm looking for.

 

1) RedLine Oils (the very best and expensive)
2) German-made Castrol 0W-30
3) Toyota 0W-20
4) Mobil 1 0W-20 or 30
5) Castrol 0W-20

 

Don`t forget Pennzoil Ultra!,and Platinum.