Oil question on High Mileage LS
07-03-13, 05:57 PM
#16
Moderator
the experts at bobistheoilguy.com recommend 5W-30 or 0W-30 for our cars regardless of your local weather or the season of the year.
Currently under discussion there is Toyota's back spec-ing of the 2UZ engine to 5W-20 on other vehicles such as trucks which is essentially identical to our 1UZ except for displacement.
Eventually it would be cool to get the engineering go-ahead to use 5W-20 and/or 0W-20 in our LS400's but it is not recommended yet.
Currently under discussion there is Toyota's back spec-ing of the 2UZ engine to 5W-20 on other vehicles such as trucks which is essentially identical to our 1UZ except for displacement.
Eventually it would be cool to get the engineering go-ahead to use 5W-20 and/or 0W-20 in our LS400's but it is not recommended yet.
Toyota redesigned the oil pump and some others for the VVT-i engines and those can use 5W-20 but 0W-20 is not listed. I don't know the situation there in USA but what I can say is that we live in a place where you can experience below 0 to over 100 degrees F.
07-03-13, 06:03 PM
#17
hmm interesting that you say that. my oil cap does say to use 5w-30 energy conserving oil.
the US varies in weather but here in california, it can get over 100deg F and as cold as 0deg F in the mountains same as in japan. most of us are in the 60-80deg range most of the year.
the US varies in weather but here in california, it can get over 100deg F and as cold as 0deg F in the mountains same as in japan. most of us are in the 60-80deg range most of the year.
07-03-13, 08:18 PM
#18
Lexus Champion
Toyota is now back-speccing its engines due to the changes in modern oils, for example, with improvements in viscosity index, a 5W-30 is now the same viscosity at operating temperature as 10W-30 and yet thinner at startup, making it easier to pump and also getting the oil to critical clearances faster on startup, see the enclosed chart of new oil recommendations for older models
with modern synthetic oils, there is no logical reason to ever use a 10W-30 again
you can learn why this is by spending a few minutes reading at Oil University
MANY Toyota vehicles that were originally spec-ed for 5W-30 or 10W-30 are now retroactively approved for 5W-20, for example
Last edited by LScowboyLS; 07-03-13 at 09:55 PM.
07-09-13, 09:50 PM
#21
Lexus Champion
10W-40 wouldn't hurt the car, but it is thicker than what is optimal for the LS400, and the trend these days as determined by the enginners that come up with these modern base stocks/additive blends that have gotten so much better in recent years, both conventional and synthetics, has been that thinner oils are better, rather than thicker, regardless of what your old man taught you back in the day.
almost all wear occurs at startup, so your oil for an LS400 should be a 5W-30 or a 0W-30 (and perhaps one day with more research a 5W-20 or even a 0W-20 will be cool)
there is really no logical reason to ever use a 10W-30 or a 10W-40, save that for your lawnmower, you should be using a 5W-30 or a 0W-30
to understand more than the extent I have briefly explained here, take a few minutes and read up at Motor Oil University
almost all wear occurs at startup, so your oil for an LS400 should be a 5W-30 or a 0W-30 (and perhaps one day with more research a 5W-20 or even a 0W-20 will be cool)
there is really no logical reason to ever use a 10W-30 or a 10W-40, save that for your lawnmower, you should be using a 5W-30 or a 0W-30
to understand more than the extent I have briefly explained here, take a few minutes and read up at Motor Oil University
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