snips...

Here is some information from Racing Beat's web site on Synthetics.
I haven't priced Mobile uno or any other synthetics but their price for 10w30 is 5 bucks a qt.
Royce


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Royal Purple Synthetic Lubricants 10W30 Street (per qt)

 Racing Beat has been recommending the use of synthetic oils in rotary applications for several years. Our research  has found that synthetic oils provide superior friction reducing between sliding surfaces, reduced foaming, and  lower oil temperatures. We have tested several different synthetic oils and have found that while most offered  improved wear and lower oil temperatures, none offered any horsepower gains... except for Royal Purple!

 Our in-house testing has yielded up to a 2% performance increase after changing from mineral-based oil to Royal  Purple Synthetic Motor Oil. How could this be? Jim Mederer, co-founder and chief engineer at Racing Beat, was  truly puzzled. With over 35 years of professional racing experience under his belt, he has seen and tried just about  every ?new? lubricant that hits the market. All offered better wear and lower oil temperatures but none offered any  horsepower improvement. After spending time consulting with the engineers at Royal Purple to better understand  the reason for the horsepower gain, it was explained that the secret was the proprietary ingredient ?Synerlec?. This  Synerlec ingredient provides an ultra-slick film on internal engine components to significantly reduce power-robbing  friction. Less friction equals more power!

 Other professional engine builders have confirmed that Royal Purple Synthetic Racing Oil delivers measurable  horsepower gains. Independent dyno tests show increases up to 5% (on smaller displacement engines) with  nothing more than an oil change.

 Give Royal Purple a try with your next oil change!

I have been running Mobil 1 in my 1983 RX7 (only 66K miles) and it
barely passed the CA smog hc test yesterday. I think the catalyst is getting
contaminated. I'll change the oil and run regular motor oil and
get it re tested in awhile and see if that is the problem.
Catalyst will recover to a certain extent if you run them hard.
Of course my oil O-rings could have  rotted in 20 years as well.
It does  smoke a bit when I start it up.

Paul Lamar

You haven't done anything to the engine in 20 years?
Or did you just recently get the car?
Is this a 12A engine or a 13B?
Royce

It was the proverbial little old lady from Pasadena car. Kept it in the
garage and only drove it to church on sunday. I found it in the small
town of Santa Paula and paid $3,000 for it about a year ago.
66K original miles with the original tires no less.
Bought it for Robin but she drives the van mostly because it hauls
more stuff. All 83 RX7's had 12A engines.

Paul Lamar

Paul that car looks like mine, except much nicer right now.
Royce

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