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2006 Forester and synthetic blend
took a synthetic blend 5-30 and have topped it up with that when needed.
Today when I went in for my oil change I mentioned to the rep that it took
synthetic blend. He said, no, just regular 5-30 and that's what they put in.
When I got home I went thru all of my receipts and saw that at my 1st oil change (7k miles) the receipt said SYNB, which I assume is synthetic blend.
Two questions: 1) Altho the manual does not recommend the syn blend, was this a typical oil used for the 06. 2) did I do any harm by topping up with the syn blend?