Synthetic oil. Can it Really Go 10,000 miles?

[NYC-SE]

Yes.

In fact some synthetic oils can go far longer. AMSOIL Signature Series is guaranteed for 25,000 miles. Mobil 1 Annual Protection is guaranteed to go 20,000 miles. Mobil 1 Extended Performance is guaranteed for 15,000 mile oil changes.

Most synthetics however do not come with a mileage guarantee, instead they state to follow manufactures oil change recommendations. Having said that I would have no problem personally running any synthetic out to 10K.

Synthetic base stocks are more heavily refined and processed. This allows them to resist oxidation and thermal breakdown far better and last longer than conventional oils. You are correct that the additives wear out, whether conventional or synthetic. It does seem however that most synthetics have a more robust additive package than most conventional oils. A more robust ad pack combined with a higher quality base oil will allow the oil to last longer.

There is plenty of good info about oil at:

https://bobistheoilguy.com/forums/ub.../forum_summary

There is a whole section where you can read used oil analysis reports. There are many, many reports on synthetics run over 10K miles with plenty of life left in the oil.

Also the Petroleum Quality Institute of America has a website where they test fresh unused samples of oil.

http://pqiamerica.com/PCMO_Sample_Su...2_15_2016.html

You can tell the quality of the ad pack from these tests. You may be surprised to see some no name synthetics putting up numbers equivalent or better than name brand products.

FYI I currently have Walmart's house brand "Supertech" 5W-30 synthetic in my Yaris sump and I plan to keep it there for a year. I will not make 10K in that time but it wouldn't bother me if I did.

Read up and make your own decisions. Don't sue me if your engine blows up.

PS: Make sure to use a high quality oil filter like a Mobil-1 or Fram Ultra if you plan on running extended oil change intervals.

[bronsin]

Originally Posted by NYC-SE

Read up and make your own decisions. Don't sue me if your engine blows up.

.

Dont worry Im a firm believer that everyone is responsible for their own decisions!

Now that Im older it would be nice to change the oil once a year or every 10,000 miles. I only put 2500 miles a year on my Yaris and already change it once a year with conventional oil. Its my wife whos still working and puts 15,000 miles a year on her Camry that might qualify for once a year synthetic oil. Problem is I have oil and filters enough for seven oil changes that has to go first. Oil and filter for an oil change costs me less than $10 using Ace Hardware oil on sale once a year for $2 a quart and oil filter from Pep Boys once a year $10 off coupon and other sales I come across. Also in the 60s 70s and 80s I rebuilt dozens of VW engines so I KNOW just how much conventional oil effects engines depending on how frequently you change it.

Havnt found a good answer for the additive question yet to my liking but thanks for your input!

[Garth g.]

I got a membership to the amsoil distribution in my city last month for my wife's 2014 corolla.For the he'll of it I put it in the yaris I've drivin 5000k it still looks clean on the dipstick.I bought a extra bottle of top up car burns a bit.the bottle fits perfectly in the intereior pocket in the back of the car