I will be taking my 500E in for 30K service and I want to use Mobil 1. I live in Phoenix and I was wondering if anyone has any recommendations of what weight oil to use to get the most performance and protection from the heat (but its a dry heat) and the dust.

20W50

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325

Nice car!

Mobil 1 comes in 15W-50. I use this in the summer and would recommend this for you.

For winters in AZ, either their 5W-30 or 10W-30 should be fine. If you take the car on an overnight trip to the mountains I'd go with the 5W-30; otherwise use the 10W-30. Here in MN I use their 0W-30 but this may be overkill even in tundra country.

Thanks for the advice - and the compliment :)