My '93 300SE is most definitely a HFM system. I was given a basic lesson on this system by my mechanic when my AMM failed about a year ago. My car only has 65K and I expect at least another 100k of reliable service from her.
1992 190E 2.3(White/Navy)
1999 VW Jetta TDI(Pearl Green)
1986 SAAB 900 Base 3 door(White)
1983 Porsche 911SC(Chiffon)
1977 VW Scirocco(DiamondSilver)