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:?: Gota question for ya , dont know if this has been discussed before but will appreciate a opinion:I have a slk 320 and would like to change the oil myself . Question: Is Mobil 1 15-50 acceptable, I lve in the Phoenix area of hot Arizona . Thanks
 

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That info is in the booklet entitled "Factory Approved Service Products". The booklet should be in the folder with the Operator's Manual. There is a chart which shows which oil to use for various ambient temperature ranges. Since all the weights are suitable past the upper limits of the temp ranges, I will just give the lower temps.

0W-30, 5W-30. 0W-40, 5W-30, and 5W-50 are suitable at temps lower than -13 F.

10W-30, 10W-40, 10W-50, and 10W-60 are suitable for temps above -4 F.

15W-40 and 15W-50 are usable above 5 F.

20W-40 and 20W-50 are for temps over 23 F.

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