[Ruger]

I recently took my car into Westway Ford for my first oil change at 5,000 miles last week. I noticed on the invoice they put a quart of ZAK Oil Conditioner and only 7 quarts of oil. I know a couple of guys at Westway Ford on on the forum here. I have nothing but good things to say about the dealership. I was just curious if they did this on every oil change or just the first oil change. I have heard that oil conditioners don't prolonge engine oil life and can damage the engine. I was just curious as to why they would put it in without telling me and if they would put it in on the next oil change. Is it safe leave in until next oil change or should I change the oil. I didn't want to put anything about it on the customer satisfaction survey. I know the dealerships are graded on these and I have had nothing but positive experiences in the past. I will of course next time tell them to just put in 8 quarts of oil. I was just wanting to hear others opinions.