Question about 1985 Mercedes-Benz 190

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What gasoline octane is recommended for 1963 Mercedes 190C (engine 121.924)? Engine has a total of 137,000 miles on it, but was rebuild 54 miles ago.

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That engine has a compression ratio of 8.5 : 1, It will tolerate the lowest quality of fuel found today. In fact, it may run worse on the expensive stuff. Just make sure the timing is set correctly.

Posted on May 09, 2009

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Caddy just started surging at road speed with throttle steady. Idles fine, and when you mash the gas performs fine, just surges and jerky at steady throttle about 40 to 55 mph.


Sea Foam will clean your engine - intake, injectors, combustion chamber, etc. "Hi Test" will not.

Higher octane fuel actually has higher resistance to exploding. High compression engines need higher octane to prevent 'pre-combustion' or detonation (explosion). Diesel engines do not have a spark plug and rely on diesel fuel detonating due to the very high compression (sometimes 2.5 times what you see in gasoline engines). When octane is not high enough, just the compression stroke will cause the gasoline to detonate on its own prior to the spark plug firing, causing pinging or knocking.

So, DON'T USE 'HI-TEST' gasoline to clean out your engine - it will NOT perform that function for you!!!

Feb 03, 2015 | 1999 Cadillac DeVille

2 Answers

My honda accord ex 91 is running exellent since i changed the ignition wires and spurk plugs. it has 107,000 miles, manual transmision. for more power and gas saving, what kind oil motor and gas should i...


With that many miles there is no point in putting synthetic oil in the engine because it will probably be too thin and cause the seals to start leaking. Keep the oil changed regularly (every 3000 miles) and use a brand name 5W-30 grade oil like Mobil1 or castrol. As far as gas goes I would put a tank of high octane gas in about once a month. You can try using high octane all the time but check your mileage per tank on the regular grade and then after you've filled you car about 4-5 times with high grade so you can see if it really is making a difference. Also check your owners manual to see if it recommends higher grade gasoline.

Jul 08, 2009 | 1991 Honda Accord

Tip

Octane Myth


What is octane? Octane cannot be seen, but it is of utmost importance when it comes to gasoline. One thing for sure, higher octane fuel costs more. Allot more! Simply put, octane is a measure of gasoline's ability to resist detonation, which you hear as pinging and knocking in your engine. The higher the octane the more the fuel can be compressed without detonating before you want it to. Detonation, ping, knock, whatever you want to call it, occurs when the air/fuel mixture ignites before the spark plug fires. The mixture ignites from compression and not from the flame of the spark plug. In other words, the higher the octane the less likely it is to ignite prematurely. The only benefit to a high octane fuel is that it allows an engine to run at a higher temperature and with a higher compression ratio without pinging. Higher octane fuel does not provide more energy, more power, better mileage, more torque, burn cleaner, clean your engine, and is not better for the environment. If the engine is pinging when using the correct octane fuel, then it may be necessary to move to the next higher octane to prevent pinging, and damage to your engine, unless there is another problem. If you are using higher octane fuel for any of these reasons, STOP, you are throwing your money away. Also, never use a lower octane fuel than is recommended by the manufacture. If the manufacture recommends 89 octane then use 89. If they recommend 87 then use 87. The key is what was the engine designed to run at to achieve optimum performance and mileage? One exception is when you are towing a heavy load with a vehicle designed to run on 87 and you experience pinging. In that case it may become necessary to switch to 89 while towing. In conclusion, race car engines are designed to run on high octane fuels due to their high compression engines. You cannot make your engine a race engine just by upping the octane. Save your hard earned money, and use exactly the octane you need.

on Jun 19, 2010 | Honda Accord Cars & Trucks

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2002 Mercedes C320 very poor fuel economy ~8 mpg, no engine codes or faults present


I'm not sure what the problem is specifically, but I can assure you this--you're basically throwing money way (and possibly exacerbating the issue) by using 93 octane fuel. Your car is timed and tuned to run most economically and with best performance with 87 octane fuel. The higher the octane, the slower the fuel burns. Longer burn time can equate to more power, but ONLY if your engine is designed and tuned for this application.
Couple of suggestions..checkto make sure your exhaust is "free". A plugged catalytic converter can really rob mileage. Tire pressure and air filter are worth mentioning as well.

Jan 01, 2013 | 2002 Mercedes-Benz C-Class

1 Answer

2002 ford explorer with 137,000 engine just yesterday began to knock. Oil is ok,


Sounds like a piston knock due too not having a oil change previously

Feb 27, 2012 | 2002 Ford Explorer

1 Answer

What kind of gas does a maxima 2001


According to page 10-3 of the 2001 Nissan Maxima Owner's Manual:

FUEL RECOMMENDATION
Unleaded premium gasoline with an octane
rating of at least 91 AKI (Anti-Knock Index)
number (Research octane number 96)
If unleaded premium gasoline is not available,
unleaded regular gasoline with an
octane rating of at least 87 AKI (Research
octane number 91) can be used.
However, for maximum vehicle performance,
the use of unleaded premium gasoline
is recommended.

Engine "knock" is not just an unusual sound - but over time can cause real damage to the engine. You *should* use fuels with the recommended octane levels, but if you choose to use fuel with a lower octane level due to reduce fuel costs - do not repeatedly use fuel that causes engine knock. Find the "sweet spot" between the cost of lower octane fuel and an octane level that does not cause knocking. Expect fuel economy and performance to drop with lower octane fuels, too.

Good luck!

Feb 12, 2012 | 2001 Nissan Maxima

2 Answers

What grade of fuel do i use in the v8


Your car requires a minimum of 91 octane gasoline. If you use a lower grade fuel, it can cause a condition called detonation (sometimes called engine knock) this will cause serious engine damage.

Mar 11, 2011 | 2000 Lincoln LS

1 Answer

What type of engine oil do you recommend to gasolin c 180 car?


the over filling would have been a problem although if there is no oil leaks then it should be fine for the moment.
most european cars take a similar blend of oil, you want one of the following;
10W-40
10W-50
10W-60
depending on the weather you are getting, ask the sales person which would be best for the conditions

Nov 10, 2009 | 1994 Mercedes-Benz C-Class

2 Answers

Gas


Best way to check is by looking at the gas cap. If it does not say "Premium fuel only" you should be safe. Higher octane rated fuel is used for higher compression motors, and I dont belive that your engine (my guess is the 5.4 V8 should be around 9:1 compression) needs the high octane.

Mar 12, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

What type and grade engine oil do i use


Use 5w30 oil in this car, preferably a synthetic. The manufacturer recommends this grade of oil and it needs to be changed every 3000 miles.

Dec 13, 2008 | 1998 Dodge Intrepid

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