Hello,
I did a forum search and read up on the Castrol Syntec 5W-50 motor oil.

I realize it is MB recommended and that apparently it is not 'true' synthetic like euro made grades.

Since I have about 10 quarts I plan to use this on my 1995 C280 (approx 48K miles). This car has always used dino 20W-50. Changed oil every 3000-3500 miles. Car is City driven 98%. Low mileage car, low use.

No harsh winters here in San Francisco.

How many miles can I travel on this synthetic?
Can I double the mileage to change the oil after 6000 miles or safely endure more?

Thanks

Den

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD

I really don't see a problem with doubling your change intervals, as compared to Dino oil.

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2007 C 230 Sport.