My sons 2010 Civic runs like silk on 5W20 Valvoline full syn with Maxlife tech... Valve train was much louder when I used Mobil 1 and Quaker State Ultimate durability.
I have owned a LS and a GS 430 for years... Valvoline full syn with Maxlife tech 5W30 goes in both every 7500K miles. Sold the LS430 to my brother recently and it runs like silk. My GS430 has 41K miles and also runs like a new car. Hard to beat the 06 lexus 430's.
My sons 2010 Civic EX 1.8L always used a little Mobil 1 on every OCI. Switched to QSUD and it did not burn any oil but I thought it ran much louder... Switched to Valvoline full syn HM with Maxlife 5W20 and it runs quiet and has not used any oil over the last three 7500K OCI's. The car has 128K...
My wife's 2018 Outback with the 3.6R has been smooth as silk. We have been using the dealer for all maintenance and they have been using 5W30 syn oil at around 5K-6K OCI's... 30K total miles so far and mostly all highway miles. Very impressed with the Outback... I may start doing the OCI's...
Maxlife semi syn is the way to go. I have had many collector cars that sat and I always used Maxlife semi syn... I have used it in modern higher mileage vehicles and it has work well Good luck with your decision.
Any Synthetic motor oil today will handle 5K OCI's... Mobil Super Syn should work well for you and I would just stay with it. Are you sure they always use a syn oil? Make sure they do it. LOL.
Just drive and enjoy your GX460, they are fantastic vehicles. Follow the maintenance in the GX460 manual and if you use syn oils, your GX will last way past your ownership.
I have recently again installed(4 tires) the H rated RT43's on my sons Honda Civic and they had tread left on them at 60K miles. Probably would have made it to 75K miles, but I always change them out early. Winter traction is important here in Wi... The civic has 130K miles on it.
I have used Valvoline HM full synthetic with Maxlife technology in 3 different vehicles and it quieted down or even completely stopped any ticking sound. Always have used different synthetics and switched to this oil and all my vehicles seem to love it. Dont know why but it works well Good luck.
I do OCI's at around 8K miles(2010 Honda civic with Valvoline full syn with Maxlife tech and use the Fram Ultras for 2 changes. They handle 16K mile very well...
I believe you are asking about Valvoline full synthetic High mileage with Maxlife technology... I have used the 5W30 and 5W20 versions and they both seem to work well... Very good at quieting down my sons Honda civic engine and also works well in my Lexus GS 430 V8.
Pretty hard to beat the General Altimax RT43... They have really good traction in bad weather(Wisconsin) and also last a long time. Price is starting to creep up but they are a really good tire that I have on one sons 2010 Honda Civic and my older sons 2016 Mazda CX5.