1) You stick to the recommended oil change interval in your owner's manual 2) You choose the correct viscosity recommended in your owner's manual (10W30? 10W40? I don't know for these cars)
ONce the oil meets API SM/SN etc, you should be fine. People overthink this stuff sometimes IMHO.
Company does recommend anything once the supplier approaches them in the correct way. Ever noticed that Ftfarfan very close to lifestyle lol. Also on the audies their engine caps says use castrol oil (advertising gimmick) but Southern sales uses Shell.
Also note that the work shop manual says to use GL4 Spec oil only in the gearbox but for some reason Lifestyle uses GL5 shell... probably due to the availability
Not seeing anything definite on the GL4+ spec. Rumour has it that its a GL5 with the chemical properties of GL4, therefore being compatible with both. Im sticking th GL4 until beter info come about.
The correct oil to use is 5W-30 but it is ok to use 10W-30 the first number represents the oil viscosity when the engine is cold and the second number represents the viscosity when the engine heats up. The "W" after the first number stands for Winter but that doesn't really matter. If you use an oil with a higher viscosity like 20W-50 your "tap-pits" will start to make noise because the oil is to heavy and its not lubricating the parts fast enough.