If you drive your car in winter don't even wait to buy synthetic. It is unbelievable how much easier the car will start and you can tell the motor is not so loaded while warming-up when it's 15 degrees. I'm still blown away how easy it starts when it is 20 below.

As for changes- I use Mobil1 and Wix filters. DO NOT BUY FRAM FILTERS! (they are cardboard inside!) Use Acura, Wix or Purolator. Anyway, I change my oil at 10,000 miles with a filter change every 5,000 miles. When I pull the cam cover the head is just as shiny as the day I bought it and I've had an oil anaylsis done and it came back excellent.

Farmers swear by Archer synthetics- supposedly they will 'hint' you can change your oil every 15-20k miles. I wouldn't wait that long, but if the oil is that good it's still better.

 

just switch mine, dunno if it's just my feeling or what, but i feel the engine runs smoother and a bit more power than before...

probably just my feeling cause i know i just switch to 10w30 mobil 1

 

Yeah, and after I wax my car I swear I gain another 5 horsepower. :lmfao:

 

Than I want your wax- pick up How to Build Honda Horsepower. The entire book is nothing but actual chassis dyno tests on Honda/Acura parts -intakes, gears, throttle bodies, etc. They saw 4 horsepower at the wheels just switching to synthetic. Obviously they can't test it on a dyno, but I saw at least 2 mpg increase in town and 4 mpg increase highway. You DO notice a difference in how the entire feels. It is smoother. And if you live where it is really hot or really cold, your an idiot if you don't run at least a synthetic blend. When I had a turbo Mustang my oil temp was always cooler and more stable. I could sit and idle longer without the creep.

 

Oh, I'm going synthetic .....but I'm going to hold you to your 2 mpg town and 4 mpg highway gains.

 

I saw that here too... but I'm also gonna attribute the increase to fresh oil as well

 

If your oil has been in long enough to gain 2 & 4 mpg when you change it, it's been in too long. And I'm guessing you're scraping it out with a putty knife. You will notice a difference.