I,ve been changing my own oil for quite a few years now and always used conventional oil. In my opinion synthetic oil was an expensive waste of money. However, after viewing all the post's regarding synthetics on this forum, I decided to give synthetic oil a try. I changed to Mobil 1 last weekend because that's what most of you seem to use and all I can say is YOU WERE RIGHT. My Max runs smoother, revs easier and the really good part is ...if the extended change interval of 7500 miles is realistic, I will only have to crawl under my car 3 times a year vs 8 to change my oil! Oh yeah, and according to my math, I will actually be spending LESS annually on oil changes.

Regular oil = 8 changes/year(every 3000 miles)
Oil $ 1.15/qt X 34 qts = $ 39.10
Nissan Filter $ 5.00 x 8 = $40.00
TOTAL Annual Cost $ 79.10

Synthetic oil = 3 changes/year (every 7500 miles)
Mobil 1 $ 4.49/qt x 13 qts = $ 58.37
Nissan Filter $ 5.00 x 3 = $ 15.00
TOTAL Annual Cost $ 73.37

Gotta Love It!

 

I don't think that you should change it every 7500 miles. I always changed my after 3000 miles regardless of the kind of oil. I switched to mobil 1 tri-syn last year and it was worth every penny. To some it is a waste but i have the money so why not spend it on my baby!!! anyway, i think changing it every 3000-3500 miles is the norm. Am sure others would agree. Right?

 

Even if it's common it's still excessive with synthetic, waste of money, time and creates excess pollution.

Dave

 

 

Do an oil analysis after 3k miles and it will tell you if it neeeds replacing.