Ive got a HR31 with the older redtop motor, its got apparantly 100,000 on it but its probably more like 150, anyway it blows no smoke and has even compression all over the board so it's in good condition. Pretty much stock standard but it does get quite hot in summer (sits on half temp - should get a proper guage though)
Anyway I was thinking something fully synth 10-40 or should I go something thicker like 50w for summer?