These questions are intended for Gordon Torreson through the diesel forum. Hi, my name is Ron Hughes and I own a Hunter 40.5 sailboat with a 4JH2E as its auxiliary engine with 650 hours on it. I have a few questions to which I would really appreciate having expert answers . I would be grateful any light you might shed by taking the time to answer them. Perhaps in the process you will generate some new customers! I recently had a diesel repair shop in the town of Uclulet on Vancouver Island in B.C. Canada tell me that I needed 4 injector nozzles at a cost of about $150 each. Is this a reasonable price? Isn't 650 hours WAY early to need 'em? Since I am now the proud owner of 4 of these new injectors, is there any way that Yanmar might help defray my cost if in fact they failed prematurely? Do they care, and if so, who should I contact? What is the brand and order # for the manufacturer's (Yanmar) recommended antifreeze, and what makes it the product that I should use? Is there a special ingredient or process that you might explain? Can I use Mobil 1 effectively, or is it a bad idea to use synthetics? If I can use Mobil 1, which viscosity would you recommend? Are they better or worse than Delo 400 30W which I now use? Is Bio-Diesel OK to use? There is a supplier here who is making bio-diesel from used fryer oil from KFC who claims it is OK, what do you think? Is "Soy Gold" a better choice? If so, why? What blend percentage etc.? I have made these questions short on purpose. If you would like me to provide any further info, just let me know and I will try. Thanks in advance for your expertise and help! Ron Hughes Commodore, The Hunter Sailing Assn. of Oregon