right b4 i blew my engine up i tried castrol syntec oil straight 30w. i was getting a ticking noise from my block. the guy that supposedly was going to work on my car suggested a thick oil. i agreed. that didnt work so i took the svt to him. he said he thought carbon was built up on the pistons. anyway 10 mins after i left his bouse i threw a rod. i have heard thatif u mix sythetic oil with regular then ur engine will lock up. is it true cause he says he used regular 10w-30 oil.
