No worries,most folks use 10W40 and don't notice any issues but looking at your car it looks fairly modded so is probably running higher turbo temps etc so the oil may be more likely to breakdown. oil choice is always a tricky subject and many will argue their choice of oil is the right one but i go with what i have been recommended by a pro not what my mate uses. Just because everyone else uses something it dosn't always make it right. Always happy to help.