Quote:
Originally posted by 420 benz
SO Based on all of the above GREAT info, if i do not hear any ping or knock in my engine at idel or high speed then it is o.k to use 87 octane in my 1989 420 sel.
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The critical test for detonation is low revs, high load. If an engine pings at idle it will be destroyed quickly under load.
Find a quite street, preferably next to a wall. Open the window so you can hear sound bounce off the wall. From a stop, accelerate lightly until the transmission shifts to second, then open the throttle about 3/4. If it doesn't ping, you're okay.
Duke