Shell, Chevron and Safety-Kleen (Kleen Performance Products) each notified U.S. customers of upcoming general price increases for finished lubricants that take effect from mid-July to early August. Factors cited included increasing costs of raw materials impacting product manufacturing and increased delivery costs. Shells price increase of up to 10 percent on finished lubricants takes effect July 16. The Safety-Kleen price increase is for up to 9 percent on all blended lubricants and grease products effective July 16. Chevrons increase of up to 9 percent on all lubricating oils and greases goes into effect Aug. 1.