wth...you passed cali smog test??!

 

passed without any problems.. %02 meas 0.5 at 15 mhp .. and 0.5 at 25 mph.. hc (ppm) .12 at .15 rpm and . 22 at 25 rpm ... co (%) .14 at 15 rpm and .46 at 25 rpm all were way below max .

 

Did you use their complete Z-max system? I used it once on my Fc vert a couple years ago.

 

Note: Your "owners manuel" from 85 is based of the oil burning technology and research info available of that time period. Fast forward 20 years later and todays synthetics can be used on your engine.

 

yes i used the kit . i also called zmax they said it would be ok to use and that it would help the apex seals

 

FYI We have been using Amsoil oils for over 20 years in rotary applications. We even did a test with one in the 80's. We did a engine tear down at 10,000 and 20,000 miles to see what was happening inside. the engine ran clean, and the oil O rings on teh rotors were still the green color with no markings on tehm. By this time (20,000) the color should have started to change as well as some carbon build up. (Some Carbon is a normal reaction to the combustion. Excessive amount are not the norm). This engine was as clean as the day we put it together. We use the Amsoil in all of our engines and transmissions.

 

My original Mazda owner's manual directly states to not use synthetic oil.

 

What year Rx7 do you drive?

 

My 88 and 93 owner's manuals both said not to use synthetic. I didn't listen (I use synthetic engine oil) and have no regrets.

I recently had my 93 engine torn down after running synthetic for 25K miles. I found no evidence that the synthetic oil was harming anything.

-Max

 

86 base model. why do I have the feeling i just made a fool out of myself?

 

LOL Nawwwwww. Just remember how much everything has improved over the last 18yrs.

 

yea, thats true.

 

My 2 stroke race bike uses and recommends synthetic oil, it burns, I run it on a 100 to 1 mix. I also run mobile one in my 1st gen with a working omp. The only draw back is expence

 

cmon guys theres a simple solution to all of this. PREMIX!

 

why do people say not to use syn for the break in? there are alot of vetts/vipers/z-cars/infinities all getting syn from the factory with no probs

 

Thats becuase rotarys and pistons are two totally differant engines. Pistons don't burn oil like rotarys do. The synthetics can effect the break-in of the apex seals.

 

/\ how? what facet of syn is bad? detergent levels? film strenghth? does anyone have clue or is this urban legend that has not yet died

 

I'm no expert but the lubricative properties of sythetic oils are higher than conventional oils. While breaking in a rotary, you don't want this type of oil in the engine because the OMP is going to inject it into the combustion chamber to lube the apex seals. This will keep the apex seals from breaking in properly. Pistons don't have this problem because the compression rings don't have as much direct contact with oil. They only get lubricated with the leftover oil from the cylinder walls that the oil rings leave behind.

You also need to remember that some synthetics have more detergents than others and todays synthetics have improved over these last few years. Remember the last Rx7 sold in the US was a 95 model. Mazda was basing their info on oil technology of that time period. Todays oils is a whole differant storey.

 

There have been problems with Vettes running synthetic from the factory breaking in slowly or simply burning a lot of oil (as much as a rotary with a high burn rate).

-Max

 

/\ thought that had to do with the oil controll ring tension.

 

PLEASE Read this if you are thinking of using ZMAX. Basically says it probably does nothing and may do harm...

http://www.ftc.gov/opa/2001/02/zmax1.htm

 

I just use regular castrol 20-50 because its cheaper than synthetic.

 

I have used Mobil 1 in my 1st gen for 21 years, car spent first half of life as primary driver and autocrosser and my 3rd gen for 9yrs. Engines run cooler and gain a few HP. No problems