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Regular oil vs. synthetic

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Old 09-10-2007, 09:10 AM   #1
thenrie [OP] thenrie is offline
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Regular oil vs. synthetic

I know there was another similar thread, but it didn't address my question. I just bought a 2000 Tacoma, SR5, TRD, 2.7, 5sp man, 4wd, 120K miles. I want to change all the fluids, including engine oil, tranny & xfer case oil, F & R diff oil. The guy on the phone told me that with that many miles I should just stick with regular oil. He also seemed to indicate that if the vehicle has not had synthetic in it in the past, I shouldn't start now.

What is the problem with mixing oil with synthetic? How do I tell whether the truck has had synthetic in it, and why shouldn't I go ahead and change to synthetic now if it hasn't had it before?
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Old 09-10-2007, 02:31 PM   #2
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the thing with synthetics is their cleaning abilities, which can tend to cause small holes in the seals..........just on occasion though. i think you will be fine running synthetic if you wanted to......just watch to see if your motor starts to have any leaks. it may even be a good idea to run a high mileage synthetic with that many miles on your truck, just my opinion of course.
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Old 09-10-2007, 04:48 PM   #3
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Synthetics are more "slippery" if you have small holes in your seals that regular dinosaur oil might not slip through you might get a leak if you put the more slippery synthetic in it.
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Old 09-11-2007, 04:29 AM   #4
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Thanks, guys. I thought maybe there was some sort of compatibility problem, sort of a water-and-oil type thing. I bought the Mobil 1 High Mileage 10w-40 after reading a thread on bobistheoilman.com, which was recommended on the other oil thread. Pretty good stuff on that page. I know Toyota recommends 5w-30, but I figured I was ok going with 10w-40, with 120K on the engine, even here in Pittsburgh.
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Old 09-11-2007, 02:16 PM   #5
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Quote:
Originally Posted by thenrie View Post
Thanks, guys. I thought maybe there was some sort of compatibility problem, sort of a water-and-oil type thing. I bought the Mobil 1 High Mileage 10w-40 after reading a thread on bobistheoilman.com, which was recommended on the other oil thread. Pretty good stuff on that page. I know Toyota recommends 5w-30, but I figured I was ok going with 10w-40, with 120K on the engine, even here in Pittsburgh.


i think you made an excellet choice. shouldnt give ya any problems at all!
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