My family owns a 1997 Lawnboy mower with a commercial grade 6hp B&S engine on it. I'll admit that the oil was not changed every season, and sometimes in its younger days it may have gone 3 years with no oil changes (I was younger at the time and didn't know any better). However, we typically mow 15hrs a season so that's not too bad.
Anyway, I've been personally changing the oil consistently for the past few years now every season. Last year I did a Frankenstein mix of Mobil Clean/Pennzoil/Castrol 10w40. It would smoke a little bit on start up so I switched to HD 30.
I put Castrol HD 30W in it this time, and it still smokes a little on start up for about 5 seconds...it blows black smoke out of the exhaust.
Is this something to be concerned about, or could it possibly be the residual multigrade 10w40 in there getting burned out?
Thanks.
Anyway, I've been personally changing the oil consistently for the past few years now every season. Last year I did a Frankenstein mix of Mobil Clean/Pennzoil/Castrol 10w40. It would smoke a little bit on start up so I switched to HD 30.
I put Castrol HD 30W in it this time, and it still smokes a little on start up for about 5 seconds...it blows black smoke out of the exhaust.
Is this something to be concerned about, or could it possibly be the residual multigrade 10w40 in there getting burned out?
Thanks.