aanclto

My Gs has a little over 205xxx. Still running strong. What would be better for it? 5w30 or 10w30?

khoi714

iTrader: (2)

Just use oem recommended 5W30 oil.

TrueGS300

If it runs good and makes no odd noises, stay with 5w30. No need to go thicker unless its getting clacky noises or has lower than normal oil pressure or something.

Gs300maste

I think you will be fine either way but I personally noticed the difference in fuel economy when I switched to 10w30. My work is about 5 mins away from the house and I do cold start the car a lot, pretty much all city driving through a week unless I go out of town sometimes. Its just an enough distance for my car to warm up from leaving the house to work every time and vise versa. My MPG dropped by 2-3mpg after switching from 5w30 synthetic to 10w30 synthetic.....

Reason why I went with thicker oil is because I was worrying about the frequent cold starting and engine wear. Seems like the change Ive made to the car is back firing on me now with gas mileage. Honestly thought that sort of small changes would make such a difference in mpg. Car still runs fine though.

Gs300maste

My car does about 15mpg in city now. It gets as same mpg as driving my Yukon in city. GS300 gets bad gas mileage in city driving! Plus it requires 93!

shwalker07

You should try amsoil. I noticed a MPG improvement when I use that oil.

kevin3344

Closing in on 236,000 miles with my GS400 and I've only ever used 5x30. After 20 years I think I'll stick with what Lexus recommends.

Gs300maste

I will look more into Amsoil or Mobile1. I usually use Mobile1 for my built Hondas. I simply chose the cheap Walmart synthetic oil for my gs300 because my car is at over 200k miles on its clock with original motor and transmission. I wouldnt know anything about the weight/brand of oil that have been used for achieving 200k miles from only looking at its service records of oil changes in the past anyways. However small changes in MPG adds up over time. Well Im not really worrying too much about it though since I think if I cared about MPG so much over cheap or more expensive synthetic oil then it would make more sense for me to drive any 4 Cylinder FWD car as a daily. I still appreciate the fact that how those old Lexuses would make such a great dd in 2019!

99rx

iTrader: (6)

Valvoline Full Synthetic 5W-30 is all I've used the past 3 years.

brainsurge

0W40 all the way...best oil you can get!

Dampfwalze

I started using that now. Before... Last 10 years 80k miles i used Mobile 1 full synthetic every 6 months probably 3-4k miles max. I don't know if it's related, but now I'm burning 1qt per 2k miles. Going try Pennzoil Platinum to see if it burns less, but i might not be driving the car much longer, trying to switch to an LS which I think I'll use the amsoil and change it once a year.

And I was wondering if the climate impacts it and using a slightly heavier oil, but we're only talking 10-20*F at most in Texas. I can see how the synthetic plays major role in reducing wear on the engine when warming an oil up from zero degrees or worse in the North.