- Joined
- May 7, 2023
- Messages
- 1
We have a 1988 Mazda RX7 with an odometer showing 81k+ miles. We don't know whether it rolled over, but it has at least this many miles. Based on the condition of the car, I'm inclined to think it has 81k miles and not 181k miles. We bought the car from a dealership that had no service records. A rotary mechanic inspected it before purchase and said it was in great mechanical shape, and we drove it from FL to NC, and aside from a new battery, it was flawless.
We put in Idemitsu 20W-50 Racing Rotary Engine oil. Then we learned that some people at least, say not to use synthetic oil. At 80k miles and 35 years, the engine has been broken in. We can use conventional oil on the next change, but is the synthetic so bad that we should change it before driving it again? We
put on about 30 miles on the new synthetic.
As an aside, at $100 for 5 quarts, I don't mind using conventional.
We put in Idemitsu 20W-50 Racing Rotary Engine oil. Then we learned that some people at least, say not to use synthetic oil. At 80k miles and 35 years, the engine has been broken in. We can use conventional oil on the next change, but is the synthetic so bad that we should change it before driving it again? We
put on about 30 miles on the new synthetic.
As an aside, at $100 for 5 quarts, I don't mind using conventional.