You list a very basic maintenance list, there are many things to check to be a "full" maintenance. Start with your owners manual. There's a dealers check list too.

Why use synthetics if not necessary? It's a matter of cost, does it's higher cost buy you more longevity or better performance? I used Mobil 1 on my RENNTech modified motor but standard oil on my stock motors. Just replace on schedule.

When in questions, use factory filters, buy them from discount Benz suppliers or eBay bulk for a cost savings.

There are specific plugs for this model and several brands to chose. Don't use Platinum.

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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD
'92 500E, 110k, Spruce green, stock SOLD
'94 E320 Cabriolet, 130k, E500 wheels, Emerald green SOLD
'94 E320 Cabriolet, 110k, black, stock, SOLD
'88 300TE, 229k, dark grey, SOLD
'90 300CE, 212k, white, new paint, SOLD
'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion