The thought just crossed my mind since Gas prices are ridicusously high. Even though most Mercedes cars require/reccomend PREMIUM grade gas, can you put in REGULAR and put in 1-2 bottle of Octane booster that claims that will boost your ocatene points by a certain number? WIll this have any ill effects or havea ny harm to the engine? Its Just a thought since I was working on my car yesterday.

If my math is correct, for a 15.5 gal tank, you would need about 2 gallons of 114 octane booster to raise a tank of 89 octane regular to 92 octane. Hardly cost efficient. Around here, premium is about 20cents more per gal, so an extra $3.00.

glenmore

...and I think a gallon of Octane Booster goes for about $14...

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

Octane booster is virtually worthless. Yes, many will run on regular (I do), or at least mid grade, but you may have to modify your driving style to avoid high load at low revs where detonation is most prevalent.

Also, detonation will be more prevalent in hot weather due to high intake air temp.

You didn't mention you year/model... whatever, you just have to experiment.

Duke

I've been able to get away with running regular in my 300E for most of the year, up until a couple months ago when it started getting really hot around here (near 100). Then I started hearing pinging, as Duke said, at low RPM with heavy load - usually when cruise was on, on the highway. I switched to midgrade as the temps went up, then eventually to premium. In a couple months I'll be able to start working my way back down to regular again.

Regular is fine in my car when the temps are regularly about 80 and below.

__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

I was running fine on mid-grade...but switched back to premium when our temps went over 90... I will be back at mid-grade in a few weeks.

I think mid-grade gets me 1-2 more mpg

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]