Boat Maintenance: A good reason.......
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Name:
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CAT BOAT
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Subject:
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A good reason.......
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Date:
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9/6/2009 3:22:37 PM
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They request Merc. labeled because of the content of different engine oils. Not to make a long post but here is the deal. Some years back, most, if not all car AND marine engines had flat tappet camshafts. Those engines used regular old motor oil. Being the climate we are in, I think it is better to use a straight 40wt oil. Over the past several years the engine technology has changed, and internal oiling requirements are somewhat different. Most newer engines have "Roller" lifters and camshafts. These turn more freely and lifters do not "slide" against the camshaft. They simply roll along and offer more effeciant (spell check) production of power. They also have less drag and don't rob extra power to turn. Some oil manufacturers stopped putting zinc in there oils, because it was not neccessary for use with these new "Roller" valve trains. The zinc promoted even and constant wear on the older style flat tappet lifters. Zinc is not a factor in the newer engines with "roller" assem. Also, considering the operating temps of car and marine engines it is best to use a very high grade engine oil. Next time you drive your car, look at the engine temp. It'll prolly say 210+. Well, years ago that was HOT. The marine engine also runs around at 4,000 rpm plus, (your car engine rides around at 1,500 or less) it runs much cooler than that so make sure you use a good name brand oil. We like Valvoline VR1 40wt. Royal Purple, or Kendal. Aslo use Castrol from time to time. Just don't stop at the Zippy Mart and get that cheap stuff you see on the shelf. Sorry for the long post. This is my opinion only, and I base that on what I see here and information I have read and hands on knowledge I believe to be true. WHEW. I am going back to cooking.
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