Originally Posted by goggs

You think its 10/40 oil maybe the answer. Don't forget that manufacturers spend loads of dosh on making up, via an oil producer, an oil to suit their engines. An oil that doesn't form sludge in operation for example. So I'm sure someone will give you guidance on here regarding the oil to use, Semi or full Synthetic. Look back the threads and you'll get the answer or try the oil producers website by adding your reg or van.