I have a Porsche Boxster with a "new" IMS bearing and have Motul 8100 X-cess 5W40 installed. Car is driven monthly & I am trying to determine should I change oil by millage or by time in engine.

  • Welcome to Motor Vehicle Maintenance & Repair! If you follow the maintenance schedule, you shouldn't have an issue. Most maintenance schedules tell you to change it on either mileage or time, whichever occurs first. – Pᴀᴜʟsᴛᴇʀ2 Jan 11 '18 at 0:24
  • See this as the topic is similar : engineering.stackexchange.com/q/18834/10902 – Solar Mike Jan 11 '18 at 1:02
  • You can follow the schedule parameters as given or you could get your oil tested as per the other question... – Solar Mike Jan 11 '18 at 1:04

This is an excellent question, I had a BMW M6 from 2006, and it was an oil eater. But the factory said that I should change the oil every 3,000 miles with full synthetic.

There's a catch though, the harder you drive your vehicle... the quicker you'll need to change it. I had dirty and dark oil in my M6 after 2,000 miles and it was time to change it. Normally though, it would be around 3,000 miles when the next change needs to happen.

You can drive a car 1,000 miles per year and actually not need to change the oil. Given you don't let it sit for too long (like months...). enter image description here Using oils that keep your engine running well is crucial, that factors into the overall quality of your engines performance and longevity of that quality.

( attached the picture of my M6)

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  • really no its not a good question because it just draws a bunch of anecdotal opinion type questions... – agentp Jan 15 '18 at 18:17
  • @Martin could you provide a rough estimate of the oil consumption? How many qt's would you refill at what mileage intervals? My vehicle goes through oil and I'm still trying to gauge how normal its consumption is. – jxramos Jan 15 '18 at 19:00
  • This answer, like much you'll find on the internet, is purely opinion. I'm specifically talking about "... and actually not need to change the oil" remark, because it's incorrect. Oil degrades over time as well as over mileage. Here's a reference which tells why. – Pᴀᴜʟsᴛᴇʀ2 Jan 15 '18 at 20:55
  • Actually the less you drive the more often you need to change oil. The biggest challenge for motor oil is water blowing past the rings and condensing in the pan . If the engine is run for "awhile" it heats the oil and boils out any water. Long ago , a hard test to pass to get API certification , was the "aunt Minnie" . That put the car or engine in a cold room ( 32 F ? ) ; start and run 5 minutes . then shutdown for 24 Hours ; repeat for a certain number of cycles. The reference from Paulster2 more or less covers this under "moisture" and "fuel dilution". – blacksmith37 Feb 14 '18 at 21:21

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