Posted by sotxbill on July 10, 2011 at 11:50:58 from (70.234.245.89):
In Reply to: 15w40 oil posted by rodgernbama on July 09, 2011 at 22:22:02:
15w-40 hd oils are heavily fortified oils with tons of additives... therefore they work well with most all engines.
The have addtives that fight coking and super clean the engine.
The extreame base additives can and do remove deposits in engines. So.. if you use a modern hd oil in an engine that is totally gumed up, it can cause the sludge to slowly dissolve and break loose from the engine surfaces. in a few rare instances where an engine is coked up at the pistons, the carbon can break loose and score a cylinder. that could be what happend where any modern hd oil is introduced into a serverly gummed up engine.
I use 15w-40 in all my engines except where problems with engine require an ultra special oil. or you can upgrade to 5w-40 hd oil to get even better protection..
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