today when i started my car when it was cold. usually it would reach up to 3k and slowly go down but for somereason today it didnt go up at all im worried somthing is wrong with my car. and when i hit the gas a little when it shifts 4th gear to 3rd i cant feel the boost i get from my 3rd gear is there somthing wrong with my car?

 

The starting RPM is dependent on temperature. If today the sun was out or something else happened to warm the 8 sensors it will not rev much. When real cold it not only will rev, but prevent you from reving above 5~6k (forget the spec) and you probably will think something is wrong.

Not sure what you mean on the 3rd gear issue. 3rd will give you a boost compared to 4th and the engine rpm.

 

when the 3rd gear switches to 4th gear it feels the same viceversa.

 

what speed were you at. 3rd isn't all that peppy at low speeds, and you may not really feel the difference between it and 4th. At, for example, 60mph you should feel a difference, but you probably won't at 25mph.

 

and i also had my oil changed not too long ago 3 qt of castrol gtx syn 5-20w
as i checked my dip stick the oil is LOW how is that possible? should i add more?
what should i do?

 

kraji, how long is 'not too long ago'? I'm sure you're aware that the Renesis eats up a little bit of motor oil, and that you should periodically check your oil level. Mazda recommends doing this at every two petrol petrol refills. So the first thing to do is replenish your motor oil.

 

The rpm difference when starting is just to warm up the cat fast enough for better emission, a higher rpm is actually bad for the engine especially during cold starting. As for the 3rd gear issue, i think its normal since performing a downshift from 4 to 3 requires either holding the throttle a bit longer or doing a two rev to bring rpm up. If this is what you are talking about, I guess its the gear ratio difference that makes the sudden drop in rpm when doing that downshift. However if you are revving close to the rpm limit, it can be done ok. Please correct me if i'm wrong.

 

From rx7club.com FAQ

 

i did my second oil change 5000 miles and its only up to 5889? close to that ratio
so should i juss top off the engine oil? what should i do?

 

Add enough oil to bring the level up to the top mark.

Did you do the oil change? Did you just add 3 qts of oil after draining the old oil or did you check the level as you added the oil? When you change the oil, you should add the new oil until the level is at the top mark. Don't just add a fixed amount of oil and assume that will bring the level up to the top mark. The amount of oil you need to add after draining the oil pan depends on how you drained the oil and how much was drained. And that can vary by up to a qt.

 

i did use 3 qt but for some reason its at below low stage

 

while you guys are talking about oil and changes...any special equipment needed for changing? I have several 2X6's nailed together...staggered...creating a stair effect and place under each tire and drive up on them to a height of about 8 inches or so. Also have a regular filter wrench for loosening if needed...a bucket for used oil. What wrench size? Anything else?

 

Barry check out this thread.....https://www.rx8club.com/series-i-do-yourself-forum-73/diy-rx-8-oil-change-dummies-12455/

be warned F type cap wrench would not fit my factory filter..fits a mobil-1 np