i was wondering what is the best oil to use in your 126. i went to the DIY guide for it on this site but still not seeing what i wanted to know or not understanding hte verbage. if anyone can put it into lamens terms. best type of oil (co) and what weight. can you ise sythetic on older cars. my 280 se has almost 400KM but hte engine was rebuilt about 1 1/2 yrs ago. so there is about 20000 KM on the rebuilt engine. jsut want to get the most life andperformance out of the engine. any suggestions will greatly be appreciate