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Originally Posted by mustang67408
What we were told was, Toyota seals were not designed for synthetic. The synthetic molecule is smaller and has rounded egdes, this will allow it to more easily slip past the seals. The springs in the seals are designed with "x" amount of tension to keep conventional oils in. Some people swear by it and have no problems. I had a bad experience with synthetic oil so between that and the cost, I wont use it. Dont believe in it. I change oil every 2500 miles and will do that till the day I die. Never had a engine problem in any vehicle I have owned and maintained.
It probably wont hurt anything, But the only way to tell is for him to just try it.
I know my luck and wont make that mistake again.
PRIUS's ROCK!!!
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Ok why does the toyota service give you an option for synthetic oil? I have had synthetic oil in my truck from the first oil change, and I check my oil every 5 fillups and change my synthetic every 10,000 miles and I will do that till the day I die. BTW I get ~17mpg and I am sure its my exhaust mod.