MBlovr - What are your driving habits? That impacts the issue greatly.

I drive 110 highway miles a day and no short trips inbetween. FSS lets my Diesel go 15-16k miles before it trips. Its set for the 10k mile interval. I'm at 250k miles; sent my first oil test off last week just for giggles since I'd never done it before.

Someone only driving short city trips would expirience VERy different results using FSS.

Those driving 80's era vehicles and using dino oil should ignore all extended interval threads. Its not applicable to their engine.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)