How long does synthetic motorcraft oil last?

by YahooAnswers

{ 4 comments… read them below or add one }

jayt November 8, 2010 at 8:45 am

I have a 98 taurus with a duratec 24 valve engine, starting using mobil 1 the very first day and service intervals of 7500mi, switched out to mobil 1 extended preformance(15,000mi oil) around 75,000 mi. only using 5w30 and the mobil 1 filter the whole time, never had a moments trouble, and ford recomends 5w20 in my car. I have no leaks and no compresson loss and not buring a drop of oil and i have 140,000 now. the nice thing with the 15,000 mi intervals, makes it easy to remember to change all the filters at once and every other oil change i know my trans needs servicing as well.


mcrg00 November 8, 2010 at 9:33 am

I have a Porsche Boxster that uses synthetic oil and the recommended oil change period (minimum) is 7500 miles. I’ve seen other oil change recommendations of 15000 miles for Mobil 1. And I guarantee you that the engine on my car is pushed a lot harder than yours.

I also lived in Europe for five years and bought a Volvo over there and the recommended oil change with the EUROPEAN manual was 10000 miles and that was with standard non-synthetic oil. Which makes you think that we’ve been brainwashed into thinking that changing oil every 3000 miles is an absolute requirement for long-term engine maintenance.

The guys from Cars Talk on NPR also discussed this topic and cited some military studies on the subject using normal oil. As I recall, the filter was more important than the oil, but as I recall the studies suggested that oil could last up to 10000 without degrading.


eunos December 31, 2010 at 3:59 pm

change your oil every 3k the guys who tell you to go 10k are not mechanics and don’t know what they are talking about.


AMSOIL Synthetic Motor Oil Dealer December 31, 2010 at 5:17 pm

This isn’t about the mechanics of the engine. It’s about the mechanics of lubrication, something that 95% of mechanics know absolutely nothing about – although they tend to think otherwise. I’m not a mechanic and don’t claim to be. I understand the basics of how engines function and can do most minor repairs, but I look to a professional (a mechanic) to provide the answers and the expertise I need when my vehicle needs repairs.

However, looking to a mechanic for lubrication advice is like looking to a chef for nutritional advice. Just because they use food in the course of performing their job doesn’t mean they understand how those foods compliment each other to nutritionally support the body. Likewise, just because a mechanic does oil changes, that doesn’t make them an expert on lubrication. In fact, in most cases, this is the furthest thing from the truth. Even with dino oil, 3K oil changes haven’t been necessary for quite some time, and, if using synthetic, 10-25k is not at all out of the question, especially if a decent filter is being used.


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