Castrol High Mileage Oil 10w40

[camlex]

Hello,

My 97 ES300, I used Castrol 5W30 Synthetic Blend from day One. Due to rear main seal leak

I am thinking to try Castrol High mileage 10W40. What you guys think, is it a good idea?

My car has only 357,400.

Thanks in advance.

[George_Jetson]

I would be suprised if 10W40 would make a noticeable difference with the oil leak. My quess is that as hot as it is here in Tx, it would not hurt to try it this summer, but I would recomend swtiching back for the winter month! LoL

[Lexusfreak]

How much to fix the rear main seal or how much longer do you plan to keept the car? The leak won't get any smaller with time & a slightyly thicker oil.

[camlex]

$700, My mechanic saying it's not worth it. wait till trans. needs to change.

Austin(UT) is taking my lots of money, I have to wait for next three years.

No choice..

[gbhrps]

Here's an inexpensive-it-might-work-fix. My 90 Nissan 300ZX developed a rear main seal leak about 10 years ago. Mind you, the leak was minor, leaving a 3 inch sized pool of oil under the bell housing after each run. It was suggested by an online forum to change the PCV valves on the car (that car had 2 of them), as their poor operation would cause increased crankcase pressure that would push oil past the rear main seal. I took the advice, changed the PCV valves, and the car has not leaked a drop to this day. Good Luck!

[camlex]

I alredy tried that, yes it did help to slow down.

Thank you for sharing. I just replaced oil with 10W40 High Mileage, Hope oil stop leaking.

Thank you.

[camlex]

I can't beleive this, let me confirm 100% but looks to me that oil leak is stop...

Today I checked clamp which hold Cat. Conveter by main seal, it's dry.