Oil Change Intervals - Why Try To Extend?

On the car that sees 6000+ miles per quarter, I would go with a good synthetic and change every 10,000 miles. With dino I would run it 5000 maybe 6000 miles.

quote:

Originally posted by John Micetic:

Nobody is throwing used motor oil into rivers (maybe in Canada folks do, so that’s why you are getting hardon on everyone that doesn’t think like you, but I doubt it).

Talk about a stupid remark. It is surprising that supposedly intelligent people can make such asinine statements. Educate yourself. That may help you from making a fool of yourself.

Trust this debate is not going to degenerate into the slanging match as per the other blog which I try to ignore.
Each to his own, many moons ago ago I was trying to sell a market leader top of the range diesel engine oil with potential to extend oil drains, to a urban bus company in the UK.
They had special circumstances and chose to buy a good cheap adequate spec oil with regular early oil changes.
Their argument, which I could not fault, was that they were minimising problems such as soot and fuel dilution, contamination and wear debris.
For me the optimum today is to try to conservatively extend/adjust oil drains to fit in with other regular maintenance procedures, properly conducted with regular oil condition monitoring and buying oil from a reliable sources with data to support spec, approval and performance claims and not adding expensive gimicky lubricant 'performance enhancers'(generally untried by all engine builders).

I'll try. I think OCI can go by group. In the old days only group 1 was availble and used for most gassers, and the squeezers used much more expensive group 2. The group 1 is good for 2-3 k miles or 2-3 months, this hold true for the stuff today. The group 2 is ok for ~6 months/miles esp in diesels where "fuel" dilution is with a near lube oil. Throw is more/bigger filters and easy to go longer. Recently? (last 15-20) group 3 is more avialable and cheaper, it is also much better, and good for about a year with some provisos. The worst SM rated oil is group2 and maybe some/all 2+, and thus can be used longer than in days of old(or lead).This I think can expalin some of the trend toward longer OCI's. Actually extend now would mean 6+ months on dino and 1+ yrs. on "syn". I did leave out grp4/5 and that is because it's different now and in the past, and only a small % of us use them.

AMSOIL oil and filter once a year up to 15,000 severe miles in my 1993 gasoline motorhome, 2006 BMW K1200LT motorcycle, 2006 Honda Civic Si I-vTec, 1997 Chevy Venture, lawn mower and 1993 Onan generator.

AMSOIL has recommended 25,000 mile/1year oil changes for 38 years and the oil has never failed yet. Works for me.

Used Oil Analyses come back as OK for continued use so considering every 2 years after filter change at one year.