Car is an 83 olds 307 with factory gauges. The other day I took it out of town - steady 2000 for about 30 miles gauge indicaticated 45 psi When exiting freeway, the gauge fluttered between 30 & 55 for a few seconds then settled down to normal. In town was fine, normal readings. Oil was Valvoline 10/40 max life, filter was wix (napa gold) was due for oil change - had about 8k on it.
Anything filter related that could cause this?
Anything filter related that could cause this?