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I would say I do 70% city and 30% highway driving. I have changed the oil prior at ~3k miles which takes me about 4-5 months to rack up

I was doing the normal ~3k miles changes and I will continue the same I guess. About 1.5yrs ago my father and I changed the intake gaskets to be on the safe side, because I found out from reading how prone they were to failure. The oil has never shown physical signs of antifreeze infiltration...

I was worried about the synthetic causing leaks

thanks, what OCI's do you recommend? Is supertech oil recycled or fresh?

I have a 93' Lumina Euro 3.1 with ~90k on it. I have been using Valvoline Maxlife 5w-30 for 2yrs or so and it worked fairly well, but this stuff is #@$%! awful expensive these days to be putting in such an old car. Please let me know any thoughts/experiences. Anyone know who makes it? I am in...