When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Do you follow the 1-year oil change interval for AMSOIL? I can't speculate how detrimental half a quart of oil meant for a much shorter change interval would be... but I wouldn't chance it.
just don't mix real oil and synthetic oil. they don't mix the correct way. if you're gonna change your oil, go for it, just make sure it's all mobil 1 then.