BenzWorld Junior Member
Date registered: Jan 2004
Vehicle: 1973 280SE 4.5, 1999 E430, 2003 SL500, 2009 C300
Location: Chicago, IL
Mentioned: 0 Post(s)
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In my 72/73 280se 4.5 (v8) I use Mobil 1 15w-50 but only drive it in the warmer months. I searched alot for info about zinc and phosphorus levels in oils and I have been a long time mobil 1 user in everything else I have. The 15w-50 has very high levels of both compared to the other grades, something like 1200-1300ppm of zinc which to my understanding is a safe amount to shoot for when selecting an oil for these. Since it's 15w and not 20w I also figured all the better with a little thinner oil when cold to get things flowing and then a 50 grade when up to temp.
Some will talk about how using synthetic is and open invitation for oil leaks since molecules are smaller etc. But I have had no issues.
I have the original manual with grade suggestions, I will try to scan and post it for the v8 in the next few days.