#121615, "RE: What type of oil do you use/recommend?" In response to In response to 3
you should only run 5W30 or 10W30 in your car.. 20W50 is way to heavy of a oil for the 420a engine. but yeah.. ya shouldn't mix differenct weights of oils.. and also.. NEVER mix styles of oil (such as normal oil.. semi synthetic, and full synthetic.. always use the same type/style) if it's a temporary thing though.. putting in a quart of oil that is like 5W30 when 10W30 is in there won't hurt anything.. atleast it shouldn't.