Date registered: Apr 2009
Vehicle: 96 E-320, 91 190E, various and sundry Euro and American vehicles
Location: N/W Chicago in the cornfields
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I also have the E-320, but a '96' (inline 6 w/ 144K)
Owners manual sez, 7.4 quarts. Agree with the points of not overfilling this car. Start as others have posted with less and fill as required. This car is hard to read on the dipstick, and it takes a Loooonnnnggg time for the oil to settle to the pan, so the dipstick will register right. I always go back and re-check for the next 2 days, to get it right. Also make sure the car is sitting dead level when you check it.
Draining the oil on this car is a snap, since the drain plug is at the front drivers side of the engine. It's in your face when you get past the front bumper.
Been a Castrol user since the '70's and run many vehicles way past the 200K mile mark. I had a S-10, with 275K , sold it and watched the new owner run for another abusive 2 years. It was a construction truck, and never saw a easy day. Also a old 71 Grand Prix, with over 375K, until the rings finally gave up. No major repairs, and I am a hard driver. I don't baby my cars on the road, but at home is a different story.
Synthetic is not needed here and if the car was run on dino oil, I would be reluctant to go over to synth. Heard bad stories in doing so. If you have been running synth, stick to it. It is actually superior (especially on those winter mornings).
I usually run a thin oil on cars with less than 100K on the clock. After that time I always kick it up to 10-40 (castrol), since the tolerances open up a bit. If as the car gets to the 200K mark (where most owners won't trust a car anymore) I look for oil consumption, and also the dreaded "Blue Smoke"! If I even see a puff of the dreaded "Blue Smoke", I up the oil again, to 20-50w. Then usually I can get yet another 75-100K before the engine gets funky.
Be religious on the oil changes, and wether dino or synth, You should be fine.