The T valve should be rated at 82'c
After taking into account the age and mileage of the car, I'd get a major tuneup replacing all. consumables
enjoy your car!.
The manufacturer has not asked you to use the more expensive stuff, so save your money,./
All you need to do is to change your mind-set. as you car was designed for regular juice.
Wishing you happy and cheap motoring,..
TT.
HI and welcome to AL
.The vacuum system starts from the vac pump on top of the valve cover and vac is applied to the booster by a rubber hose.
Repair mans for JDM cars wuill be in JAP . only.