First if you want a cheap car to drive and maintain buy a Honda. MB are great cars but you have to take care of them.

$70 breaks down like this:
Mobil 1 7x $5= $35
Filter $10-$15

So figure $45-$50 in parts throw in the mechanics time and your at $70, which is still a deal.

If you drive 10k a year you will need two a year, now is $140 that bad?

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200