I found out about the Frantz oil filters while working at White Motor Company in Dallas in the 60's. They used three roll filters on the oil and one roll filters on the fuel. These were aux filters since the engine's factory filters were left in place.

Presently I use a one roll oil filter on: 1980 300SD, 1984 300D, 1976 450SL, 1989 CK2500, and a 2001 Viper. I change the roll and Baldwin filter every 2500miles and the oil every 10,000 miles using Mobil One. I know of at least 20 clients that also use a Frantz.

The oil in the gas rigs still looks clear after 10K.

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You can get farther with a smile and a gun than you can with just a smile.

1984 300D
1985 300CD
1980 300SD
1993 SL500