which one do you all thinkis better ? are either of these oils even full synthetic base stock PAOs ? i just want the best for my car and these two seem to be the least shady brands. amsoil is too unreliable because they dont manufacture their own additive packages so it varies from batch to batch and additive company. mobil 1 seems stable as hell and wont turn from 5w20 to 15w50 in 5,000 miles. but red line seems like its doing good business too.