I have a d15b2 and I am currently trying to slow its oil burning down as much as I can. I already have cleaned the PCV valve and changed my oil from the factory specified to 20W50. This made a noticeable difference but it still burns allot of oil. I am eventually going to get the valve stem seals replaced and hopefully that will take care of most of the burning. I am aware that it could be the oil control rings as the engine has over 220,000 miles on it. It smokes a little puff on startup and eventually more as it runs. It gets worst when it revs.I realize that this is a temporary solution I mainly just want to know if 20W50 and Lucas oil stabilizer or STP treatment will actually help or if it will be too thick. Thanks.