Best Engine oil for Lexus IS

5k or 6 months just like a new one. use the recomended toyota/lexus brand oil.

0W-20 Amsoil Signature Series 100% synthetic oil changed every 5k miles. Wix 57173XP filter.

I switched to valvoline restore and protect on my 06 is250 and it’s working great. The valves are a lot quieter compared to the previous oil I was using which was Kirkland synthetic.

Finally ended up with Penzoil Plat. Can't tell a difference at all when the oil is fresh. Also engine never burned oil on Penz.

I used to use Mobil 1 in my IS 350. I can confirm my engine was quieter on cold stars when I switched to Ultra Plat.

I've used Rowe, no complaints