In my 95 landcruiser I run 10w-40. For many reasons. With that said, 10w-40 is getting hard to find in stock in my area. Would running 5w-40 negatively affect anything? I can't see how it could, but my brain is jello due to this cold I've got and I figured I should ask folks who are more knowledgeable than me. Thanks in advance, Will.