When I changed the oil in my car recently (I have a 2005 Trailblazer), I had them fill it with Mobil One Synthetic Oil as I heard it would give me better mileage and was better for my car, etc. However, no one can tell me how many miles I can run the car on this oil. I had heard that you don't need to change the oil as often with synthetic oil (not a blend). Could you please tell me how many miles I can travel before I will need to change my oil again? I had been getting 10,000 miles between oil changes.
This information is from the Mobil One site:
Switching From Conventional Motor Oil to Mobil 1
There seems to be confusion about how to make the switch from conventional
motor to synthetic. I am a do-it-yourselfer. Could you provide instructions?
-- Joe D., Miami, FL
The instructions are very easy to follow: Simply change the oil as you would
normally. Any “confusion” is just myth. You can switch from conventional motor
oil to Mobil 1 synthetic (and back again, if you want), without following any
special procedures. The only exception to this is with a higher-mileage engine
that has never used synthetic motor oil, or with an engine that has used
conventional motor oil and been poorly maintained. In these cases, you should
still follow the same basic oil-change procedures (drain the old oil, remove
the old oil filter, put in new Mobil 1 and put on a new oil filter), but you
should follow a regimen of one or two shortened oil-change intervals. For
instance, let’s say that your regular oil change interval is 5,000 miles. If
you’re switching to Mobil 1 under the circumstances mentioned above, make your
next Mobil 1 oil change in 2,500 miles, your third Mobil 1 oil change 3,500
miles after that, and then follow your normal 5,000 mile oil-change interval.
The reasoning behind this staggered interval is that a high-mileage engine, or
one that has seen infrequent oil changes, will likely have a considerable
build-up of sludge and deposits. Mobil 1 will help clean the engine as you
drive, but it will have to work much harder in a very “dirty” engine, and so
it is best to change the oil more frequently for those first few thousand
miles. After that, you can rest assured that Mobil 1 is continuing to keep
your engine running clean and well lubricated for mile after mile.