whats the most popular engine oil recommended for my TL. I was recommended Gulf Western Oil 15w-40.. Any other recommendations??

Engine oil has been discussed to death previously - we've had some very lengthy discussions about it recently. Use the forum search, or go to www.google.com.au and type "site:www.aussiemagna.com/forums engine oil" and have a read of some recent threads about oil. If you still have questions then feel free to open up a new thread.