SAID

hi
can i use 10sw30 synthetic oil for my 2013 gs350 (110000 km ) ??

thankyou

jonathancl

Why would you deviate from the oil recommended by the manufacturer?
0w20 synthetic is recommended for this and many other modern engines.

10w30 is thicker at all temperatures and will not flow as designed through the engine. You should not do that.

0w20 has been recommended for many engines from many manufacturers for more than ten years.
There is no evidence that it has affected engine wear in any way: cars are still exceeding 250k miles without issue.
Polymer additives have changed how oil lubricates; viscosity and lubrication are not related the same as they were in the past, and that continues to evolve.

Oil 'thinness' is not a measure of its ability to lubricate, only of its viscosity.

jordanhigg

I would go with what is recommended but they are going to "to thin" oil imo due to gas mileage. Yes, the weight of oil makes a difference.

but use full synthetic and your gtg

GSRockstar

Knucklebus

Do you have a way to monitor oil pressure? If not, I would not go that far above spec without some empirical evidence that the oil pressure is too low due to excessive clearances in the motor.

This, like all modern engines, is designed and built to close tolerances to support using such a thin oil. Older engines were built with high tolerances and the oil had to be thicker to protect the bearings.

The only way I'd go UP in oil weight would be if I was in an extremely hot environment, such a desert or tropical climate that never sees freezing temps. Your mileage will decrease with a thicker oil. I would not try anything thicker than a 5W20 or possibly mix in a single quart of 10W30 into the rest of 0W20 for a mixture of 2W22. Too much of a change all at once might damage seals and other unknown things.

Superman60

Lexus spends millions of dollars to engineer their cars, if they say use 0-20 believe me use 0-20.

er34

In cold climate like Alberta, the most wear happens during the first few seconds of starting the car when the oil is settled and thick. Putting in anything higher will cause even more wear during those crucial seconds.

UDel

Why would you want a heavier weight oil on startup? Just as a little extra to prevent leaks? Not worth it. If you want to use a heavier weight oil I would go with OW 30 as it has better engine protection when the engine is hot and the same protection as OW 20 when the engine is cold/startup.

GSRockstar

Superman60

Really? That's why cars go 300,000+ miles now. It has a lot more to do with than just fuel mileage, tolerances of engine parts are a lot more tighter than cars of old. You start using thicker oils you're asking for trouble. Synthetic oils have molecules that are much smaller than conventional oils, and therefore their lubricant properties are so much better. Even Synthetic oils with higher weight numbers. Lexus recommends 0-20 that's what I'm using. My Tundra calls for 0-20 haven't had any issues with it, it's a 5.7L V-8.

Knucklebus

Oil is what the first number shows so 0w20 is 0 weight oil with modifiers to make it act like a 20W oil when it is hot. Since Lexus knew what oil was going to run in the engine, they built the tolerances tighter so that a thinner oil will flow, lubricate, cool and generally suffice for these engines. These are not race cars running loose tolerances and thicker oils.

I've built motors that required 20W50 due to the clearances and the expected RPM/load the motor was going to be subjected to in its life. The crank clearances were set at 0.0025 on the mains and 0.003 on the rods because it was going to be slinging 110mm pistons 99mm up and down at 6500 RPM.

charley95

The things people do to chintz on something as cheap as oil to a Lexus is nuts. Just go to Wal Mart and by the correct Mobil 1 and be done with it if your changing it yourself.

GSRockstar

drgrant

Not sure if serious, I guess all the people putting 200K+ on toyota V6/V8s just by using the factory recommended oil weight, are all just full of BS..... lol. the motors running just fine are just figments of our collective imagination.

As far as the trans fluid goes you are right about that, but frankly that's a way different ballgame from the motor....

-Mike

GSRockstar