I'm using Motul Turbolight 10W40 for my 4G63T. So far so good. Been using it for almost 2 years now. Pricewise, cheaper a bit compared to 6100. Oil can last for non-stop long distance travel (non heating) and can cover on every 5000km service interval. Oil loss about 10%-30% during 0-5000km usage.
For info, I've tested/compared using Turbolight and 6100 in my other High rev car/engine NA.
I noticed 6100 helps a lot on low-end aka improved pick-up (felt lighter), but a bit 'heavy' on end of mid to top speed.
As for Turbolight, car low-end like usual (a bit heavy compared to 6100), but during end of mid and top power, it helps a lot. Good for hway merembat-ing.
Donno other oil brand, cause never used and somemore I've sticked to Turbolight since year 2001, while the price was RM65!!
i want to ask if 10w40 can cover 5000km,then 15w50 can cover how many...and 5w40 ?
