Originally Posted by Cito Pelon
I don't get this "burn off" thing about synthetics. I have the same amount of Amsoil in the crankcase after it's been in the engine for a year. Granted, I only put apx 8-10k on my vehicles in a year. But if there's no change on the dipstick after 10k miles, I don't see how 30k miles would make a change on the dipstick. Apparently, there's no burnoff with Amsoil.
And if there was "burn off", I'd see it on the sparkplugs, they'd be fouled. My sparkplugs have always been remarkably clean.
I don't know anything about other synthetics, the only synthetic I've ever used is Amsoil. So maybe the other synthetics have a burn off problem, but I haven't seen it with Amsoil.
The synthetics I use are so light that they do burn off after a while and I'm not sure why there is no indication of fouling or things like that. Car passes emissions just fine too. I just think it's such a light oil that after a while it just tends to basically evaporate due to heat and friction and exit out the exhaust. Either my car is screwed or something is happening to the oil. Every mechanic that has looked at it says it's a great car and there's nothing wrong with it. But, I keep a spare quart of oil in the trunk and check the oil every few weeks, especially after about 3k after the oil change (it gets changed every 5-6k miles). The oil just gradually disappears somewhere and I have to top it off. I don't have to add a lot of oil, but I do have to add some oil after a while.