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).

This message has been edited. Last edited by: Roger Davies,

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.

This message has been edited. Last edited by: Tim Vipond,