Odds are these cars do use the same fluids. Back in the late 70's most transmissions used 90w oil. But these new cars normally use regular dexron mercon tranny fluid. You know the pretty bright red kind. But if you want to make sure just call your local dealer they will tell ya.
So you have a manual and you want to change the gear box oil right??? May i ask how many miles this car has on it?? You really hardly ever need to change gearbox oil. Check this oil by taking the plug out of you transmission. If this oil is clean and has a brand new look to it do not change it. The only time these oils really need to be completely changed is when the car has been in high water or the gear box has been rebuilt so for your peace of mind if you just have general wear on this car, you probably are just throwing money down a crawdad hole ha ha
Could have many causes, but a good start could be to have the oxygen sensor voltage output checked.(In exhaust system) This would explain why mixture/ variable idle speed occurs.
Has it ever been tuned up ie. Plugs, wires or boots, filters, and injection cleaning? Check the tire pressure, under inflated tires are the #1 cause of poor mileage. Also consider fuel quality and additives that don't contribute to combustion. I hope this helps, Take care.
LUCAS is one of the best sold at any parts store. And is made for just that. Read MNFCT recommendations and directions for uses on EGR, PCV and intake manifold build up.
you may want to look at your Catalytic / O2 sensor(s) Watch this video to learn more about how the O2 sensor works and what is required of the O2 sensor for it to work in the vehicle. https://www.youtube.com/watch?v=DvKZ2GDYEz4 Note: The vehicle in this vehicle does not compare to your own since the sensors on your vehicle may not be under your hood but may be on your header exhaust or you could have one on the lower exhaust pipe and one on the upper exhaust / manifold.
