Justin97gt

Hey guys, I have a 98 with some simple mods to it. I haven’t changed the spark plugs, wires, or fuel filter since I got the car. I put about 30,000 miles on the car. Should I change the spark plugs and fuel filter? What kind of spark plugs should I use? Ive heard a lot about NGK but what model.
Thanks,

MJH78

Yes and yes. I'd flush the cooling system too. Replace trans fluid and rear diff. fluid.

Justin97gt

Thanks, what kind of spark plugs should I get NGK or Denso…ive heard a lot about the iridium but what model.
What gear oil should I get Royal purple…..75w 90 or the 75w 140?

jwarner0297

for spark plugs since you only have mild mods go with motorcraft they will be best for you. the gear oil I would go 75w 140 for better hot protection.
The NGKs/Denso aren't really better if you don't have nitrous or f/i

Justin97gt

What about the ngk G power or the v power, are the motorcraft better than them?