To avoid the cold weather starting issues with 20w50, you could try a dyno 10w50. It’s typically less desirable because of the large number of additives it needs to get the wide 10-50 spread, but for an old 91 oil burner, it may be just the ticket.
To avoid the cold weather starting issues with 20w50, you could try a dyno 10w50. It’s typically less desirable because of the large number of additives it needs to get the wide 10-50 spread, but for an old 91 oil burner, it may be just the ticket.