Valvoline 4-stroke Motorcycle Oil

my68barracuda said
"Without telling us, they put a synthetic blend in her car and in a couple of days, it was smoking, burning a quart of oil every 500 miles and leaking oil from seals."

don't get upset, but your credibility just took a hit with that,, maybe you should have added a dose of your MotorKote.

Motor oil is motor oil, synthetic can have better properties than motor oil made from crude. Assuming that the SAE weight of the oil is comparable, synthetic will not leak more or burn more than conventional motor oil.

Believe what you will. That was our experience with synthetic blend oil put in my wife's previous high mileage car (2003 Nissan Maxima) that had dino oil run in it since new. Began burning oil, smoking and leaking past the seals onto our drive. Changed back to dino oil and all was well by next 3,000 mile oil change.

Wife's current 2013 model car has had synthetic oil in it since new and yes, I add 4 oz. of MotorKote at each oil change, same as our older cars running the Valvoline 4-stroke Motorcycle Oil. I had not discovered MotorKote when she had her 2003 car and never tried it in that car, so cannot say. Its not marketed as something that will lessen oil consumption nor restore seals and I wouldn't expect it to. It reduces internal friction and wear. Noticeably. That's why I use it.

Best regards,

Harry