synthetic mix
 

Used pennzoil 10w30 synthetic blend in my 13b it makes great oil pressure and idles very smooth, but now the car is slow as balls, it wont boost hardley over 2psi and if you get on it fairly hard from a dead stop it hesitates very bad then finally picks up at about 3k. Not really asking a question just kind of posting an experience. I will be switching it out with conventional today. (Maybe thats why the owners manual says to not use synthetic:icon_no2: )

welcome to the board.

dude, your oil is not causing what you describe. start looking elsewhere (ignition system, vacuum leaks, wastegate control, etc.). when was your last tune-up?

by the way, the short version of the Mazda/synthetic oil-thing is they are not allowed to tell theit customers not to buy specific brands of oil and i believe they had a beef with Mobil a long time ago.

on a more self-serving note, have you ever considered Amsoil?

I just bought the car last week and before i bought it i had the dealership do a tune up on it, or so they said they did, but the plugs are brand new wires are new from what i can tell, i always use at least 89 octane, and this started happening right after i changed the oil so that is why i am confident it is the oil. Im not sure of vacuum lines though. And actually i was considering amsoil that is why i tried a synthetic to se how it would perform, and after i saw if the results of a synthetic were positive i was going to get amsoil or torco.

atf i heard you can use atf as oil what would that do?

:confused: atf as oil will get you a new engine.

Well, I have heard of people using atf in cyl engines to help free up sticky hydrolic lifters. Its not 100% atf though, maybe jsut a quart or less i believe