I am selling a 48 convert able with 2004 Volvo 715 hp engines that have been flawless and am looking at a gorgeous 42 Sabre with 2005 Yanmar 440's. I am shocked at all of the bad reports about these engines. Are they true of all of them or are there a few disgruntled owners out there. These Engines only have 880 hours of saltwater use. Can anyone advise me?