well synthetic is always the best, but it all depends if your pocket holds that, natural aint bad either like castrol gtx anti sludge protection its up ther $4.20 per quart. for the oil weight you got to look in th owners manual at technical refrence page, if i recall it right i think its 10w40 seasonal year round..Hello,
I just took delivery of a 99 S320 with 12,411 original miles---What oil would you experienced W140 owners recommend? (synthetic or natural, and does brand make a difference?).
Thats exactly right the preference for Mobil 1 is a marketing agreement, it's still a bloody good oil though. That being said I'd run any decent synthetic from a major brand without thinking twice.There's so much confusion about oil it's kind of ridiculous really. Your car was delivered originally with conventional oil. The requirement, in the U.S. only, to use synthetic oil on 98+ FSS cars came later as a product of the FSS lawsuit settlement. That lawsuit effected only U.S cars. In other markets conventional oils are still approved for 98+ cars. In any case the problem that initiated the lawsuit was the 98+ 112 and 113 motors. Your 104 motor is a holdover from the prior era and never had any problem with conventional oil.
The other great myth is that Mercedes, the factory, recommends Mobil 1. The factory actually approves very specific lists of oil by year and market. The MBNA U.S. market recommendation of Mobil 1 is the result of a marketing and diistribution agreement in the U.S. MBNA is paid to say that so it is hardly an independent and objective assessment of your interests. Better to listen to the factory.