Is synthetic oil ok for 7s?
 

I was told by the person who sold me the car that synthetic is a no no for sevens... If it is true why is that and what are some other basics I should know? Like fuel injector cleaner (stuff you put in the gas tank) is it ok? And what oil do you guys recommend for an FC? I always used Penzoil 10w30...

Any info is great help. I am new to the car but trying to learn. so if I ask something stupid, sorry. :)

A quality Synthetic will be fine inside your rotary engine. Most even burn cleaner then there non-synthetic counter-parts.

As far as I know, fuel injector cleaner wont harm anything. I've never heard anything about it damaging stuff on our cars before.

FYI, if you really want to get your injectors working properly, consider a professional cleaning and balancing for them.

#1 synthetic isnt bad it just helps our motors get flooded a little easier
#2 10W 30 is not the oil to use ALWAYS use 20w 50 its better for our motors
#3 injector cleaner wont do crap just take the injectors off and get them cleaned and balanced for cheap maybe $100

TwEaK

NO NO NO Synthetic is bad. The reason being is that with Rotarys with ever cycle a tiny little bit of oil is injected into the rotor housing and i burned away. Well the people that designed synthetic oil did a really good thing and made it so that it dosnt burn(well not as well at least)so it lasts longer and you dont have to change your oil as much. Well this presents a problem with rotarys because when the oil is injected into the rotor housing it dose not burn all the way which over time will leave nasty resado in turn messing up your engine.
In short i would not recoment using Synthetic Oil. I use Penzoil 10W30 as well and no problems yet. Hope I helped you and enjoy your fc

Sure, synthetic oil is great! As long as you've pulled off your oil injection system and are running premix...

My engine died after running a few thousand miles on synthetic (I didn't change the oil that was in it when I purchased it, and it had a load of synthetic). Coincidence? Maybe. However, I'd run non-synthetic in a rotary that had the stock oil injection system.

-=Russ=-

Ah man DO NOT POST UNLESS YOU KNOW... BOGUS REPLYS HAVE NO PLACE HERE.

Your answer shows that you are clueless on this subject so please do not reply.

i accidentally put synthetic in my motor and then i realized it was synthetic i drained the bitch out...phew

Another clueless answer!!!!

It is a myth that good quality sythetics don't burn well or leave residue.

The 20W50 Amsoil has a flash point of 482F, and less ash (what is left after the oil is burned) than the famed Castrol GTX oils as well as any other 20W50 other than Redline. As a quick comparison, the ash left from Valvoline Turbo (conventional oil) is .99, while the ash left from Redline and Amsoil, both are less than .5 (with actually Redline showing less than .01 in many cases).

There are less additives and junk in the oil in most good quality synthetics than any conventional oil... which means fewer deposits.

That is why I recommend their use to people that have the extra money. Hands down, without any doubts, and proven over and over and over again, good quality synthetics burn cleaner, with less residue, and increased horsepower. The only thing that does not make them attractive is the cost.

I will say this again, for the people unable to search on this subject or too dumb to read the data sheets:

A good quality synthetic (like Amsoil, Redline, Neo, Royal Purple, Mobil1) is perfectly fine to use in a rotary. It is the poor quality ones (like Valvoine, Castrol Syntec, Havoilne, etc) should be avoided like the plauge as they do have the increased additives and left over ash that makes there use unsuited for a rotary or any high reving engines operation. Valvoline Synthetics and Castrol Syntec oils typically have a ash of 1.5...:o

And that hench is the problem... Mazda could not say, its okay to use Redline synthetic, but not Castrol syntec. Of course, Castrol GTX oils are probably the best conventional oils made, but Mazda couldn't say use one, but not the other... so they said don't use any.

And just for referance, This has been proven in rotary engine operation since the mid 80's. I have old RX-7 Club of America newsletters that say the same thing... so it is not some new testing that has proven this... Its the same thing over and over again.

And now I am closing the thread, because of all the clueless replies (TwEaK and BlackIceGuitar were the only correct replies in the whole thread) and the number of times this same subject has been covered to death... please search next time before posting.