Question about Mercedes-Benz 300-Class

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Engine tune up specifications

What is the recommended gap for the spark plugs on a 1986 MB 300E with the automatic transmission? Thanks!

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  • 8 Answers

0.8 mm

Posted on Dec 06, 2013

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I use only Valvoline as it doesn't tend to gum or sludge my engines like Penzoil or Quaker State did.

I assume this is a 4WD since your asking about the gearbox, and it's an automatic.

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the correct transmission fluid is ATF+4, any other trans fluid will spoil the transmission.
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SOURCE: what are the igniton timing,firing order, spark

1998 Mercury Grand Marquis
4.6 liter V-8 VIN "W"

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SOURCE: what is the spark plug gap specification for a

go to or call an auto pARTS STORE they can tell you the plug gap.

Posted on Jan 24, 2010

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If you could elaborate a bit more on what was done to the car we could pinpoint the problem right away. However, typically a tune up is plugs, wires, cap, and filter. Given those four changes, I would point my finger at the plugs. Many of times spark plugs do not come pre-gapped. Meaning the distance between the metal and the electrode, white looking ceramic are not measured per spec. If you did not gap the plugs, I would recommend taking them out and adjusting the gap to spec. You can call the dealer and ask them for the recommended spec. I have attached a pic of a spark plug with an arrow indicating how the gap is measured. You will need a feeler gauge to measure the gap and adjust.rltofixya_3.jpg


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Make: ISUZU
Model: PICKUP
Year: 1986
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Specifications Notes Use only Mercedes-Benz approved fluids

TYPE AF(DEXRON-II (R) Automatic Transmission Fluid) CAPACITY, Initial Refill*: 1982-85 190E 5.5 Liters 5.8 Quarts 1982-92 All w/V8 engines 7.7 Liters 8.1 Quarts 1986-91 190E, 260E, 300E 2.6L 6.0 Liters 6.3 Quarts 1986-91 300 Series 2.6L, except SL 6.2 Liters 6.6 Quarts 1990-91 300SL 6.0 Liters 6.3 Quarts 1992 600SEL 7.7 Liters 8.1 Quarts * Add specified quantity. With engine at operating temperature, shift transmission through all gears. Check fluid level in PARK, and add fluid as needed
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