Seeing as I was just asking in a previous thread about your favorite brand of oil. I got really curious about oil additives. Have you ever used it? Do you like it? Does it actually make a difference? So many questions......lol
I used it before.....made my oil too thin. I started hearing a knock in my engine so I did an oil change with fresh oil and the knock went away. Never gonna use it again. Not worth the risk of damaging your motor.
When you have a vehicle that is new and on good synth oil there is no need to add anything.
For the most additives are great if you are trying to correct or mask an issue the easy way. Things like a sticky lifter in an old engine that has been setting things like Marvel Mystery oil will help but that would not mean I would put it into a new engine.
Use good oil, change it based on the DIC GM has given you and stick to the recomended weight.
GM is putting Mobil one in most of the new cars and I think they are using it in the Terrain too. Mobil is rated the new GM rating and is on the recomended list by GM. It is not as expensive as it used to be.
Keep in mind additives are like fix a flat You would not put it in a tire that is not leaking would you?
There are a lot of opinions out there. But the one that counts is GM's. They do not recomend any additives and if they had something that they felt would help them in their 5 year 100.000 mile warranty they would recomend it. Syn Oil is the main thing they recomend and 5W30 so stick with it.
There is a lot of snake oil out there some of it will not hurt but some will. I have seen many people kill an engine with things like Slick 50 etc.
I use Castrol (w/Dexos) Edge..As said below, no need to add anything else..Just change your oil and filter at least every 5000 miles or less and you will have a strong solid engine for as long as you drive it.
Since the engine in mine is Direct Injection and there is some concerns about carbon build up over time...I use a Marvel Mystery Oil(4oz per 10Gal) In the gasoline...Keeps the upper part of the engine pristine.