Quote (gusdidit @ Jul 21 2013 11:33am)
The general theory is that synthetic oil and dinosaur oil don't mix properly and can cause clogging problems down the road.
right, so if you not sure whats in there you go with a semi synthetic aka 'synthetic blends' they are blends of mineral oil with no more than 30% synthetic oil
that's what you want to use if you have no idea, Quaker State and Castrol are the 2 brands I have seen that have the most options
and then when its time to change the oil, get a paint pen or a sharpie and write it on the underside of the hood or core support/ some where so u don't forget what you used