AMNss

I use Castrol 5w40 when I change it outside the dealership, but the dealer uses the Toyota genuine motor oil.

f16mobus1

My IS350 only has less than 3000 miles but I'm thinking about using full synthetic Mobil1 5w30
every 5k miles OEM filters. My truck has 127k miles and has not had any problems.

gmanusmc

You do realize that 0w20 is the Lexus spec?

Visit bobistheoilguy.com - lot of good info over there on 0w20 oil. Toyota Genuine Motor Oil (TGMO) is very highly regarded as one of the best, if not the best, 0w20 available. It's custom formulated by Mobil for Toyota and Lexus vehicles.

dagobert

I stick with the TGMO.

1) Toyota/Lexus engineers are smarter than I am

2) Stuck with the TGMO on my FJ Cruiser for near 9 years and the FJ runs like a champ.

gmanusmc

Yeah, and you guys up there get it way cheaper than we do down here!

forum429

The weight has nothing to do with oil quality.
The weight has everything to do with temperature.
Just because its a good quality oil does not necessary means it fit the atmosphere.
Thinner oil when its cold.
Thicker oil when its hot.
Try to run the 0W20 in your lexus on a track day and see if it's really custom formulated for your lexus.

gmanusmc

Wow - you sound like someone with a chip on your shoulder for some reason.

Been around cars for awhile - I understand all that you point out about oil weights, climate, etc.

I was just pointing out to the previous poster that newer IS350s are specced for 0w20 (at least here in the US). Not sure what the warranty ramifications are for deviating from that - maybe he's not concerned about that - I don't know.

What I meant by custom formulated (maybe worded badly) is that from what I have read and understand, Exxon Mobil formulates the oil per Toyota's specs.

Thanks anyway, we don't "track" my wife's IS, so probably won't be taking you up on your suggested experiment - obviously, racing one of these cars would require a different oil choice.

Doublebase

I'm not an oil expert, but I think you might be right regarding the toyota synthetic. Evidently the modifications to it are an added moly package, which supposedly coats engine parts and provides added protection. It apparently has a more robust package than other formulas that are on the market, which may allow extended drain intervals. There are other "protection" additives in just about all synthetics, boron, zinc, but to have a robust moly level is pretty nice in terms of comparisons to other brands. I'd say it's a pretty high quality oil.

lexi90

+1 I got free oil changes until 20K! It came with the car purchase

rgonza1

I just did my first oil change. I picked up Mobil 1 0w-20 full synthetic extended performance from my local Auto Zone. I was able to score it for $1.00 a qt since they rarely sold this grade at this particular location. I ended up buying 25 quarts of oil. This should last me a few years!

For the Oil filter and oil plug gasket I picked up OEM from Lexus Dealership.