Edmunds Answers



  • MrShift@Edmunds 07/12/08 12:16 pm PST

    I use Mobil 1. It's tried and true and I see no reason to shop around at this time for allegedly incremental advantages claimed by other oils. Better cold starts, better protection for severe heat/towing situations. I think the claims for better gas mileage are pretty slim, maybe 1-3% if you are lucky. So instead of 20 mpg you might get 20.5, maybe.

    If you have no severe driving conditions (towing, severe climates hot or cold, racing) and no factory recommendations/requirements (like VW turbo engines MUST have synthetic), then you don't need it IMO.

  • subearu 07/12/08 2:26 pm PST

    I used Mobil 1 in my Outback and Forester XT, as well as our MPV. This year, I now am running Penzoil Platinum in the MPV.


  • canddmeyer 07/12/08 5:36 pm PST

    Mobil1 is my preference too. I've used all of them except for Royal Purple and Amsoil. No complaints with any of them. I prefer Mobil1 because it is race proven and almost always available for a good price at WalMart or Costco. The only complaint I've ever read about Mobil1 has been on Subaru forums relative to their turbocharged engines.

  • Stever@Edmunds 07/13/08 8:41 pm PST

    I don't think synthetic oil is worth the expense so I don't use it in my (non-turbo) Outback or Quest. The Quest lived in Anchorage briefly, and my other cars lived outside there for 20 winters and they always cranked ok, even if I was away from any block heaters skiing into a cabin or something.

    Now the Quest is in Boise, where we have hot summers (105 isn't all that unusual), and it's puttering along ok at 125,000 miles on plain oil changed on a 7,500 mile interval.

    I drive them forever too - the Outback is a '97, the Quest is a '99 and up north I ran a Toyota on dead dino for 17 years.

    Now, if you really were asking, of those of you who use synthetic, what brand... then nevermind. -)

  • coldcranker 07/19/08 10:54 pm PST

    I've always been a Mobil 1 synthetic fan, but Valvoline Synpower 5w-30 may be a great synthetic since they are claiming they have 4 times less engine wear during the Sequence IVA test (part of the SM set of tests) than Mobil 1 5w-30. Thats a bold statement, actually making public how well it did on a Sequence IVA test, something most oil makers keep secret due to fears they will be compared with other oils! Congrats to Valvoline (Ashland Oil Co.). http://townhall-talk.edmunds.com/direct
    for more info and web links.

  • karjunkie 08/14/08 12:32 pm PST

    I don't because I change the oil every 3000 miles. Synthetic oil makes sense for extended oil changes of 10,000 miles and is a convenience if you put a lot of miles on your car per year and don't want the hassle of very frequent oil changes. There are a few other reasons to use synthetic oil that don't apply to me. One is that the lower viscosity will cause synthetic to flow easier in sub-zero weather and reduce engine wear in cars that are subject to very short daily commutes where the engine does not have time to warm up. Secondly, it is a good device to clean sludge out of your engine if you have this problem. Synthetic oil cleans engines better than conventional oil. Costwise, it is a toss up as a synthetic oil change runs about 3 times the cost of conventional oil but lasts 3 times as many miles.

  • dagoodale 08/17/08 6:32 pm PST

    I use Royal Purple in our 2004 Chrysler T&C and noticed at least a 10% increase in the MPG.

  • sergelbergeron 09/07/08 3:50 pm PST

    I don't use synthetic oil if it is more expensive. I really don't know which oil I use because I rely on the Toyota Dealer to put in the oil that is right for my car. I suppose one day it I do it myself I would look at the pros-cons - now I prefer to stick with what the manual says - get the oil changed every 5,000 miles.

  • rroboe 09/28/09 12:33 pm PST

    I am using Mobile 1, I have a 98 Dodge Intrepid and have about 530,000 miles it.
    I started using M1 at about 48,000 miles. I also have been using Slick 50.
    This engine has never been worked on except for the regular maintainance. Timing belt, alternator, thermostat........ The valve covers have never been off, same tranny also.
    I change my oil about every 10,000 miles.
    I get about 28 MPG my best was 31.6 MPG in the summer time.
    I lose about a 1/2 quart of oil at oil change. Engine still runs great!
    The car will fall apart before the engine! Do they make a product like M1 for the rest of the car?????? Maybe it would make that last longer too!


  • beancountant 10/13/09 9:54 am PST

    I will start using Valvoline Syn Power Synthetic Oil, I saw in a website, the motoroilevaluator.com, aside from extremely expensive synthetic oils, it came out tops in all techinical specs. Better than Mobil 1, Mobil 1 Extended Perf. It also depends on weight of the oil, some oils do better in a lighter weight and not so good in a heavier weight. The website classifies motor oil by the weight and the type, i. e. regular or synthetic. The Amzoil brand is rating high but the cost is also high. You hae to go to the website and also consider that this is compilated by a person who works for amzoil. You have to do the research , my friend.

  • icruse 11/13/09 5:27 pm PST

    Mobil 1 5W20
    Amsoil 0W20

  • cruisinlou 02/05/10 6:41 pm PST

    I have a 2003 Corvette and my manual reccomends Mobile 1 and so I feel that Motor oil is cheap insurance at any cost so I will stick with what was reccomended.


Top Engine Engine oil Experts View More

Rank Leader Points
1. MrShift@Edmunds 1330
2. karjunkie 710
3. zaken1 570
4. Stever@Edmunds 535
5. texases 315
6. morin2 235
7. 0patience 165