Yeah 85 octane? Did you go back to 1925 to get gas? Anyhow, lots of things can make noise. Small or large exhaust leaks, bad bearings in the roller lifters(had this happen on one of my mustangs), lifters just not pumping up(getting old and tired, or gummed up), bad balancer, sometimes just injectors can make a ticky noise that'll drive you nuts. As it stands, my '90 has somewhere between 120k and infinity mileage, since that's where the odometer quit, but it runs great and pretty quiet. I do have kind of a shitty sound coming from either the smog pump or a/c compressor. Your experience may vary but if nothing sounds like it's going to imminently self-destruct itself, I kind of address on the low-priority order. Far as flushing and such, running seafoam worked wonders in my '98, so I will hit the '90 with it sooner or later.
Far as oil goes, my previous small-blocks always preferred Valvoline to any other oil, however, when I started taking the '98 to a local dealer who was offering great deals on service, they put motorcraft synthetic blend in it and the car never ran better, or retained oil so well! They put 5-30 in the '98 and now have done the '90 with 10-30. It felt like a different car afterward, of course I did have the trans serviced and flushed too, but the car seriously drives like a dream. Check with your local Ford dealers as many of them offer service specials and will send you a shitload of coupons once you've been there. My better half had been going to this dealer for many years before we met and we occasionally get full service fluid changes for like 20 bucks. You can't buy oil at Wal-Mart for that so it's really hard to beat.
Far as oil goes, my previous small-blocks always preferred Valvoline to any other oil, however, when I started taking the '98 to a local dealer who was offering great deals on service, they put motorcraft synthetic blend in it and the car never ran better, or retained oil so well! They put 5-30 in the '98 and now have done the '90 with 10-30. It felt like a different car afterward, of course I did have the trans serviced and flushed too, but the car seriously drives like a dream. Check with your local Ford dealers as many of them offer service specials and will send you a shitload of coupons once you've been there. My better half had been going to this dealer for many years before we met and we occasionally get full service fluid changes for like 20 bucks. You can't buy oil at Wal-Mart for that so it's really hard to beat.
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