Motor Oil for 1991 LS400 300kmi

I got a 1991 LS400 with over 300k miles. I hear a lot of people use Mobil 1. but with as many miles as i have, i was wondering what oil would be best, for summer time in cali and for as many miles as i have. reg? synthetic? full synthetic?
thanks in advance!

go with semi synthetic 15w-40.  Better protection for high mileage.  Full synthetic is more for performance and I don't like Mineral oil.

I LIKE TO KNOW TO, MY 92 LS GOT LIKE 250THOUSAND, THE MOST MILES I EVER BOUGHT WITH THAT MANY MILES ON THERE, BUT I HEARD THESE LEXUS RIDE 4EVER IF KEPT UP?

Been running mobil-1 for almost 100k and 5 years, cars had it since 20k miles currently at 230k on the odo.  No problems to report and I'll keep using mobil1 till she don't run anymore :)

what about Royal Purple?

Mutol Excess OR leave it parked .... :biggthumpup:
 
This Oil  is made for high milage engines ....

with that may miles can you change to full synthetic or is it best to just use a blend?

[QUOTE=kingpin;346554]Mutol Excess OR leave it parked .... :biggthumpup:
 
This Oid is made for high milage engines ....[/QUOTE]
 
motul is hard to get in some states. 
 
but 300k miles is this an original motor??? 
 
I use ENEOs pretty happy with it, and its high mile friendly.

Yeah i just hit 200k this week!

Ok, here are somethings to consider. If your engine has not ever used Synthetic oil, your car will eventually start leaking due to the detergents that will clean up all the stuck grimes/minerals on the oil seals and gaskets. So, be prepared to change those seals and gaskets.

but if you have used before than go full,i use mobile 1 no problems just get a proper weight tothe temp of your state. fyi royal purp doesn't do much used it in my last car and not a single thing was diff than using M1 lol and I think import tuner did a legit test and it faild ha

[QUOTE=Garage7RP;346592]Ok, here are somethings to consider. If your engine has not ever used Synthetic oil, your car will eventually start leaking due to the detergents that will clean up all the:pat: stuck grimes/minerals on the oil seals and gaskets. So, be prepared to change those seals and gaskets.[/QUOTE]

Hey fellas!  Been tryin to look for the same ans. For my 98 gs300 . . She has 104k jus wondering whats a good oil for her . . Lemme know if anything thnks

And sorry bout switchin the car from the topic . . Jus seen the title quick and wanted to ask and hopefully get an answer from someone