quote:Sure, Grp III oil = sludge.....
............and this would be a perfect example of group III oil=sludge..........
My oil fill cap,and the inside of my valve cover looking through the oil fill opening has no sludge,soot,or varnish.
For those of you who think you are safe doing 3000 mile oil changes with receipts,think again.....
<<<<<Manufacturer warranties might refuse to cover oil sludge damage by blaming you, the customer, for poor maintenance habits or neglect—even if you can prove you changed the oil every 3,000 miles. Without warranty protection, engine replacements are $5,000-$10,000. SAAB, Toyota, VW, and a few other manufacturers have some limited coverage for sludge damage.>>>>>
In sum..........playing it safe as some have said,may not be.....playing it smart!
The smart move is to use group IV synthetic,don't get sludge in the first place,and you won't have to worry about warranty issues......because you probably won't have any issues to deal with.