See also:

Materials Added To Engine Oil
Do not add any supplemental additives, other than leak detection dyes, to your engine oil. Engine oil is an engineered product and its performance may be impaired by supplemental additives. ...

Control Setting Suggestions for Various Weather Conditions
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Tire Markings
1 — U.S. DOT Safety Standards Code (TIN) 2 — Size Designation 3 — Service Description 4 — Maximum Load 5 — Maximum Pressure 6 — Treadwear, Traction and Temperature Grades NOTE: †...