http://www.ops-1.com/
This is a link to just ONE of the companies that makes the filters for heavy trucks.
125,000 miles between synthetic lube oil changes is becoming more common as the goal.
There are two "tricks", when the filter is changes some new oil is added , as well as during normal use where oil is refilled as it is consumed.
The second "trick" is quality oil testing with a good lab
Its been 20 years or more that synthetics are changed by lab results ,for trucks , rather than mere time in the engine.
Pleasure boaters don't do enough hours per year , to amortize an expensive filter and $40 a gallon oil.
The poorer ability to control rust in storage of synthetics doesn't matter to 200,000 mile a year trucks. The extra 1.5% fuel mileage does count , along with the lower costs of lubricants.
http://www.cdlofit.com/
Is a site for truckers , and in the larger sized boats , this is where your CAT, Cummins, DD or
Iveco came from.
The problems and cures for better mileage will work as well in a boat as in a heavy truck.
NO, "saving" 4 or 5 quarts in the family grocery getter would hardly pay , so CAR mfg don't use any of this tech.
And GOD FORBID if this tech was attempted in cars , folks would attempt to go the miles on mineral oil ,no filter , no lab testing,, and only the liars for hire would have fun.
ALL the oil mfg will claim there synthetic is fine for the long term , but Shell, and the other big names are preferred.
FF
-- Edited by FF on Wednesday 9th of December 2009 12:02:19 PM