how often do i need to change my oil when i use 100% synthetic?

Question

i have recently purchased a 2007 mercury, milan, premier. at my first oil change i told the dealer to use 100% synthetic oil. when do i need to have the oil changed? they are telling me the standard 3000 miles. i thought that when 100% synthetic oil was used that the life of the oil lengthened. Please help. I want to do the right thing.

Answer 1

I agree with pbleek. The 3,000 mile oil change has been ingrained in our heads for generations. Every few years the API releases new oil quality designations (currently SM for gasoline engines) but there is no change in drain intervals!? And yes, drain intervals in Europe are much higher. Check this link for interesting facts on extended oil drains: http://www.amsoil.com/redirect.cgi?zo=1463115&page=news/oil_drain_intervals_2_06

With dinosaur oil, heat and oxidation quickly take their toll. The high thermal and oxidative resistance of the synthetic molecule keep it from breaking down into sludge and varnish.

Look into Amsoil:
XL line of synthetic oils: 6months/7,500mile drain interval (this drain interval is most likely what your owners manual says)

original Amsoil synthetic oils: 1year/25,000mile drain interval

Series 2000 Amsoil 0W-30 severe service: 1year/35,000mile great for police and taxi service


For your car you can go with the XL 5W-20 (6month/7,500), but I recommend the 1 year formula in the 0W-20 weight.

Don't let the dealer intimidate you on warranty issues, check this out: http://www.amsoil.com/redirect.cgi?zo=1463115&page=magnuson_moss


more info at my site:
http://www.number1synthetic.com

Answer 2

Synthetic oil is always superior to conventional oil. The question here is whether or not it's worth the cost in your case. Considering the fact that synthetic oil can cost twice as much as conventional oil, you need to consider which is best in your case. Unless you have a very high compression engine that is used extremely hard, the chances are that synthetic oil wouldn't provide any greater benefit than regular oil changes using conventional oil. Personally, I lean towards the use of conventional oil, and spending a little more for a very good quality oil filter, while following the change intervals suggested in the owner's manual. Regardless of the claims of extreme mileage between oil changes, you need to consider that one of the primary functions of oil is to keep contaminants in suspension so they don't damage the engine. With that in mind, it's reasonable to consider that there is a point at which any oil can't hold more contaminants in suspension regardless of how "good" the oil claims to be. Basically, this boils down your your particular situation, engine usage and demands made on your engine during normal use. Please read item #3 to see what the makers of Valvoline oil say about changing synthetic oil.

Answer 3

If i remember correctly, the mew Mobil1 they've come out with says you can go 5000 miles before changing it. I really dont think there is a set standard amount of miles/time for when you need it changed, just a general guideline. I have seen people use 5w-30 Mobil1 and go for 10k miles at a time with no problem, but thats a risk I wouldnt take. Find out what oil brand they used and go from there with your research. Good luck!

Answer 4

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Answer 5

I would go 5,000-8,000 miles, the 3000 mile oil changes are ingrained in peoples mind from the days of sloppily made V-8 engines and poor quality oils, these days you are safe to go over 5,000 miles. In Europe people go with 15,000 km oil change intervals, they drive way faster and cars have to last the well past 300,000 km. (cars are not as affordable as in the US)

Answer 6

It's really all personal preference. You can still change it every 3000, but if yer gonna pay the extra bucks for the good stuff why not wait the extra 3000? It's usally standard to wait 5 or 6000 to change with synthetic.

Answer 7

Follow what the oil manufacturer recommends.

Answer 8

Different oils claim different change intervals. Ask your dealer what brand oil they used and go from there. Personally I don't care if it is regular or synthetic oil I would still change it every 3000 miles.

Answer 9

don't believe what they say, as it's in their best interest to change oil more often.

I go 6 months, 10k miles, whichever comes first.

Answer 10

well the boxster comes with moble one full syn. and they say every 15000 now they spend a bunch on research and developement so i would go atleast 10000 to get your money out of the oil