Hello, boy where do I start? So is castrol 10w30 a decent oil? Seems way to many people do not like castrol. Will this stuff hold up for 5k miles and do some cleaning? Ive never used castrol, so I bought it, though I did not open it. Maybe I will take it back and buy Old faithful maxlife. Although For some reason I want to change. But maxlife has been working so well for 40+k miles. Stick with what's been working, or change it up to something else? I was thinking about supertech synthetic 10w30? It's 17,vs the maxlife at 13.50. Ugh. I worry about the small things in life because it's Near the only things I can change. :-/.. . happy spring! It's 55f in upper ny!