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My local Walmart here had Syntec 5-30W so, I used that last week. I don't sit in traffic or drive when it is 100 outside (since it rarely is here) and I feel OK using 5-30W. no 10-anything W was available.
My Mercedes would clatter valves if I used anything except 0-30w or 0-40w. Must be very tight in there.
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