On Mon, 18 Aug 2003 18:08:23 GMT, "My Own Little Universe"
Don't know if it HELPS high-mileage engines, but it's certainly not
HURTING my 113,000 mile, 10 year old 4.3L. I don't burn or leak a
drop, or haven't since my last oil change (almost 4,000 miles ago
Drain old oil out, pour in Mobil 1. No power flush needed, but I
suggest you change it after 1,000 miles, then again after 2,000 more,
then you should be good for 3,000-5,000 mile intervals. I only
suggest the 1,000 and 2,000 mile changes because the synthetic broke
up a lot of sludge that was in my engine and could have caused some
serious problems. I did NOT change at 1,000 and then 2,000 more miles
and didn't have any problems, but YMMV. You may just need to change
the filter, your discretion.
Slightly better gas mileage. Less initial startup wear.
Higher cost. Your engine MAY develop leaks after a short while, due
to the breakup of sludge that may be helping seals do their job. I
had ONE seal fail after changing to synthetic at 80,000+ miles when I
initially went to a full-synthetic oil (Pennzoil at the time, not
I've heard you can, but I've also heard you can't go back once you
make the switch. I don't really know if it matters, but I wouldn't
use synthetic one change and dino the next and keep alternating...
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