I been replacing quite a few bad run caps lately. Instead of just putting back the same value as what was removed, I have started looking at the label on the comp. All the Copeland scrolls have the run cap value on the label. Sometimes I'll take out a bad 35+5 370 and then look at the label and see 40,45 or even 50 mfd 370VAC. What's going on here? The comp. obviously ran for quite a while with the small run cap. What are the effects on the comp. (current draw, rpm, voltage etc.) due installing a run capacitor that's too small? Could the fact that the cap was undersized have lead to it's early failure?
Do some techs just replace any bad run cap. with a 35+5 370 because that's what they have on the truck and in most cases will work?