BenzWorld Senior Member
Date registered: Oct 2010
Vehicle: '11 Santa Fe LTD V6 AWD-Navi, '99 CLK 320 (traded for family mover), '96 200SX (SOLD) :(
Location: Hanmer, ON, Canada
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
The performance issue alone is one thing. Low octane = easier pre-detonation = knock sensor going into frenzy = computer retarding timing to compensate = drastic power loss.
Premium fuel (named so for a reason) has additives to inhibit varnishing, higher octane ratings (obvious), cleaning agents, etc. I know even an MB is a mechanical machine and will inevitably fail but as previously mentioned if you want to run regular you might as well buy a focus. Go online and see what a replacement engine for your car is worth new and let us know if regular is still an option.
It's not only an issue of performance it's also an issue of reliability and life span. If it's a cost issue, buy a focus. On a serious note look at what it costs to fill a tank of each grade.
My CLK has a 70L tank, 1.226/L reg vs. 1.369/L Prem.
85.82 fill on reg, 95.83 fill on premium for a cost difference of 10bucks week. Go a year will be 520.52bucks. over 20years is only 10400bucks. My engine new is 18something thousand. And could be killed in 5yrs on regular, do that 4x and you have a cost of 72000 dollars over 20yrs. Hope this shed some light, even though the probability is low as this is worse case scenario, but there are reasons for owner's manuals warnings.
A Benz is like a good wife: Not overly expensive to maintain, but neglected gets expensive awfully quick!