Other legal matters  — We are subject to various pending or threatened legal proceedings arising out of the normal course of  business or operations. In view of the inherent dif ficulty of predicting the outcome of such matters, we cannot state what the  eventual outcome of these matters will be. However , based on current knowledge and after consultation with legal counsel, we  believe that the liabilities that may result from these proceedings will not have a material adverse ef fect on our liquidity,  financial condition or results of operations. In November 2013, we received an arbitration notice from Sypris Solutions, Inc. (Sypris), our lar gest supplier, concerning  the existing long-term supply agreement that expired on December 31, 2014. Sypris also alleges that the companies entered  into a new binding long-term supply agreement in July 2013. Dana has filed suit against Sypris requesting declaratory  judgment relating to the Sypris claim that it entered into a new supply agreement with Dana in July 2013. These actions were  pending as of the end of 2014.We dispute the Sypris claims and believe they are without merit. Lease commitments —  Cash obligations under future minimum rental commitments under operating leases and net rental  expense are shown in the table below. Operating lease commitments are primarily related to facilities. We record a liability for estimated warranty obligations at the dates our products are sold.  We record the liability based on  our estimate of costs to settle future claims.  Adjustments are made as new information becomes available. Certain prior period  amounts in the following table previously included in amounts accrued for current period sales have been reclassified to  adjustments of prior period estimates. In 2007, we were notified of an alleged quality issue at a foreign subsidiary of Dana that produced engine coolers for a unit  of Sogefi SpA (Sogefi) that were used in modules supplied to  Volkswagen. In December 2014, we reached settlement  agreements with Sogefi and their insurance carriers resulting in a char ge to warranty expense that was not material. Note 16. Warranty Obligations 2015 2016 2017 2018 2019 Thereafter Total Lease commitments $ 35 $ 30 $ 23 $ 14 $ 11 $ 43 $ 156 2014 2013 2012 Rent expense $51 $58 $63 2014 2013 2012 Balance, beginning of period $ 54 $ 66 $ 72 Amounts accrued for current period sales 19 17 20 Adjustments of prior estimates 18 6 4 Settlements of warranty claims (41) (34) (31) Currency impact (3) (1) 1 Balance, end of period $ 47 $ 54 $ 66 Changes in warranty liabilities — 77