NyCrAzY

I have a 1999 Lexus RX300.

I bought it about a month ago with 174,000 miles on it for school commute.

& now it's time for an oil change.

I have no clue when it comes to high mileage cars, so can you guys tell me what you guys use?

I use a 5-30 on my 2004 Nissan Murano with 80k miles on it ...

Also, synthetic or no?

Thank you very much!

Kind regards.

code58

Obviously you'll get other suggestions, but with that many miles, I do believe it would be good to use a high mileage oil. There are advantages to it in a high mileage vehicle. Since you recently bought it and likely don't know it's history, I would suggest considering pulling the front valve cover off to see how clean (or dirty, sludged) it may be. that will have a bearing on what is used. If it's not real dirty, I would suggest Castrol Conventional High Mileage oil. If it's real dirty, maybe another route.

Do pay close attention to the trans fluid also!

hypervish

I'm going to suggest German Castrol 0W-30, pretty much everyone on this forum loves it. I don't use it, but it's a great oil. I use Pennzoil Ultra, I would suggest that too, but sometimes it's hard to find in 5W-30. Otherwise, it's a great oil. Both of these oils are synthetic.

I agree with Code58 you should take off the valve cover and see how it is under there.

Drain and fill the transmission with Castrol Multi-Vehicle Import ATF, it works great.