Arguing with you is a waste of my time too.I will follow Lexus recomendation on this subject.After viewing your other posts your always right on subjects you have not researched. Also my last post to this thread.

 

You can lead a horse to the water but you can't make him drink!

Adios Amigo!

 

Keep your remarks to yourself. Amigo

 

merged two related threads.

folks, be nice.

 

I finally followed up with the service department today and one of their master technicians. He stated, that yes, you can use synthetic oil for the oil changes in the LC, and as mentioned here before, just do not extend the change interval. The service department had initially misinformed me. I will keep the conventional oil in place until the next oil change at which time I will be swapping it out for the synthetic.

 

'Live Long & Prosper'

 

So, it's obvious lexus wanted to use conventional and that is what they put in the LC, even though many of their other vehicles come with synthetic. Seems odd, but whatever.

What brand of synthetic are most using for their LC ???

 

For $89.95 and conventional oil per the service manual, I will continue to do what the factory suggests. Ya think they know best?

 

Well, technically, they are the ones who "invented' the touchpad for the LC500, no ? So, no, they are not always right. LOL

 

car oil is like religion to so many... lots of arguments and in the end it makes NO difference.*

* as long as they actually change the oil at reasonable intervals with fresh oil.

 

So what do touch pads have to do with oil? Knowing whats best for an engine with millions of test miles??? LOL!

 

No reason for the LOL RJ, sorry for that.

 

The mystery to me is why Lexus recommends conventional oil but no one at Lexus seems to have a valid reason why. I have heard that at break-in that synthetic oil is actually too slippery to allow the piston rings to seat properly. But why isn’t that true on all engines. Why just the V8. And why after break-in is over, does Lexus still recommend (service managers at my Lexus dealer and others I have heard about on here) conventional oil after break in?

I have no problem spending a bit more for synthetic on a $100,000 car every 5,000 miles. And the key as everyone has mentioned is not going over 5,000 miles before a change.

This You Tube video I believe shows exactly why you should not go over 5,000 miles on an oil change. It’s long but interesting.

 

Thanks Veight! Must be someone out there that knows!

 

I suspect Lexus simply acknowledges that conventional oil is fine in their naturally aspirated V8. I'll give you my reasons why it may be OK in the LC500, but maybe not OK in other models. I doubt they are saying "don't use synthetic".
1. A V8 with a 7k redline would do better with a 30wt oil than a 20wt which is recommended for almost every other toyota engine.
2. Most other toyotas recommend 0w-20 which is only available in synthetic.
3. The LC 500 won't even let you redline the car until the oil is at a certain temperature, modern conventional 30wt oil at operating temperature is gonna protect as well as synthetic in almost all scenarios, you only see the benefits at really hot or cold operating temps or long drains. The driver with no track time and a 5000 mile oil change interval is putting very little stress on their oil--even if it's conventional
4. The LC500 has a 9.1qt sump! That is a large amount of oil for a 5L engine--more additives, harder to be starved of lubrication. Again, no sweat for a modern conventional in almost all scenarios. Especially considering most other lexus models probably take 5qts or less.

That being said, I change my own oil and filter and I use Quaker state Ultimate durability. It's a low cost synthetic option that is good when I do drive my LC in the winter and its cost is only about 2-3$ more than conventional for a 5qt jug. I can change my own oil and filter for about $58(not counting the money I spent on low profile ramps so that I can get under the car lol). I did the first oil change at 5k with conventional oil and switched after that. I'll agree its silly to spend 100K+ on a performance oriented car but put dino oil in it. However conventional oil is so good these days that my rational side knows that it won't make a difference for almost any driver at 9.1qts and 5000 mile interval.